All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
/Photos/Pictures of Fossils

Pictures of fossils, fossil hunting trips, fossil sites and photographs relating to fossil hunting and fossil finds.

10 10, 2017

Fused Bones in Primitive Birds Earlier than Previously Thought

By | October 10th, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

The Evolution of the Light but Strong Skeleton for Powered Flight

It is widely accepted that birds evolved from dinosaurs.  The Order Dinosauria is now classified into two parts, the non-avian dinosaurs, which are extinct and the avian dinosaurs (the birds), which are very much still with us.  However, the evolution of the specialised anatomy that enables powered flight is not well understood.  Birds have several skeletal modifications that greatly assist them when it comes to their aerial abilities.  Any aeronautical engineer will expound the virtues of a light but strong frame for an aircraft, birds have a light but strong skeleton with many elements fused for greater rigidity.  A team of scientists writing in the “Proceedings of the National Academy of Sciences”, have provided new evidence to help explain how these remarkable anatomical modifications came about.  This evolutionary story is likely to be much more complicated than previously thought.

Some Theropod Dinosaurs Evolved into Birds Skeletal Similarities and Differences

Bird skeleton compared to ground dwelling dinosaur skeleton

A skeleton of the Theropod dinosaur compared with a simplified skeleton of a modern bird.

Picture Credit: Everything Dinosaur

The picture above shows the skeleton of the recently described oviraptorid Corythoraptor jacobsi compared to that of a modern bird.  The bird skeleton shows a number of adaptations for powered flight, such as fused hand and foot bones and an enlarged sternum but the ground-dwelling Oviraptor possesses number of anatomical characteristics which show its affinity to modern birds.  Both Aves and the Oviraptoridae are included together in the clade Maniraptora which consists of modern birds and their closest extinct relatives from the Coelurosaurian Theropods.

Pterygornis dapingfangensis – Fused Bones

A second, beautifully-preserved specimen of the Early Cretaceous Enantiornithine bird Pterygornis dapingfangensis has fully fused hands (carpometacarpus bones) as well as a fused pelvic girdle.  Dating from around 120 million years ago, this specimen is the oldest known bird fossil which shows these modifications for powered flight.  The fossil comes from the Jiufotang Formation of Liaoning Province (north-eastern China).  This sparrow-sized creature is one of several genera known from these Lower Cretaceous deposits, only the Solnhofen deposits of Germany are older in terms of the bird fossils they contain.  The exquisite specimen shows that the carpometacarpus and the pelvis are completely fused, it had been thought that these traits did not appear in Aves until the Late Cretaceous.   The fossil record had shown that all bird fossils associated with Upper Cretaceous deposits have a completely fused hand and pelvis.  Thanks to this newly published scientific paper, the historical origin of these avian bone fusions has been pushed back some forty million years.

The Second Specimen of Pterygornis dapingfangensis

Pterygornis dapingfangensi helps scientists to better understand bird evolution.

Pterygornis dapingfangensis fossil.

Picture Credit: W. GAO (Chinese Academy of Sciences)

Great Fossils but Squashed Flat!

Named in 2015 from a single, disarticulated specimen, discovered near the town of Dapingfang, Chaoyang County in Liaoning Province, Pterygornis shows a number of unique autapomorphies that distinguishes it from other Enantiornithines and the second fossil has shown that the body plan for a rigid, fused skeleton was present in at least one species of bird from the Early Cretaceous.

Dr Steve Brusatte (University of Edinburgh), who reviewed the scientific paper, commented:

“These [fused bones] are fundamental features of the modern bird blueprint, and are integral to giving birds the strength and rigidity needed to fly.  There seems to have been a lot of experimentation among early birds, with different species trying out different ways of making their skeletons stronger and better able to withstand the rigours of flight.”

Sadly, many of the fossils from the Jiufotang Formation have been compressed and distorted as a result of the fossilisation process.  However, despite the taphonomy that ends with a lot of the fossils from these rocks being squashed flat, the researchers from the Chinese Academy of Sciences were able to identify that the fused bones in the second known specimen of Pterygornis were not a result of pathology or the fossilisation process.

The Disarticulated Holotype Specimen of Pterygornis dapingfangensis

Pterygornis dapingfangensi holotype material.

The scattered and disarticulated fossil remains of Pterygornis dapingfangensis.

Picture Credit: Wang Min

The lack of transitional fossils has hindered the process of identifying the evolutionary process towards the modern bird skeleton.  However, in this research paper the authors outline how the fusion of pelvic bones and those in the hands and feet may have evolved independently in non-avian dinosaurs, primitive and more advanced birds.  The scientists speculate that varying degrees of bone fusion were likely to have evolved in basal birds, perhaps as a result of environmental pressures or related to a refinement of flight capability.  It seems that the developmental pathway from ground-dwelling dinosaur to the skeletal shape of living birds has a few more surprises to spring before it is more fully understood.

6 10, 2017

New Prehistoric Crocodile with a Tough Skull

By | October 6th, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Ieldraan melkshamensis – The Monster of Melksham

A new species of prehistoric marine crocodile has been described after an amazing effort by the preparators at the Natural History Museum (London), to separate this crocodile’s partial skull and fragmentary jaw bones from an extremely hard concretion, in which the fossils were entombed.  Although in very poor condition, the research team from the University of Edinburgh as well as the Natural History Museum, were able to identify enough unique anatomical traits (autapomorphies), to allow a new species to be erected.  The new marine crocodile (metriorhynchid) has been named Ieldraan melkshamensis, the species name honouring the town of Melksham in Wiltshire where the fossil material was unearthed.

Ieldraan melkshamensis – One Tough Crocodylomorph with a Very Tough Skull

Ieldraan melkshamensis fossil material.

Ieldraan melkshamensis fossil with the inset showing a large, conical tooth in detail.

Picture Credit: University of Edinburgh/Davide Foffa

The specimen was acquired by the Natural History Museum in 1875, but because of its poor condition it did not attract a lot of scientific attention.  The fossil being entombed within an extremely hard concretion (septarian concretion), meant any form of scientific study was extremely limited.

Mark Graham, Senior Fossil Preparator at the Natural History Museum explained the problem:

“The specimen was completely enclosed in a super-hard rock nodule with veins of calcite running through, which had formed around it during the process of fossilisation.  The work took many hours over a period of weeks, and great care had to be taken to avoid damaging the skull and teeth as they became exposed.”

Newest member of the Metriorhynchidae

Measuring more than three metres in length, Ieldraan melkshamensis was one of the most powerful and dangerous marine predators in the warm, shallow seas of western Europe some 163 million years ago (Callovian faunal stage of the late Middle Jurassic).  The teeth with their distinctive striations (series of ridges running down the length of the teeth) indicate that this large crocodylomorph, which was very distantly related to today’s crocodilians, fed on large prey items.  It might have hunted other marine reptiles as well as preying on squid and fish.  It has been classified as member of the Metriorhynchidae family, specifically assigned to the sub-family Geosaurinae and a phylogenetic analysis places Ieldraan as the sister taxon of Geosaurus, perhaps the best-known of all the metriorhynchids, having been named and described over 100 years ago.

A Model of a Typical Metriorhynchid Crocodylomorph (Plesiosuchus)

Plesiosuchus marine crocodile model.

Available from Everything Dinosaur a Plesiosuchus model.

Picture Credit: Everything Dinosaur

The Plesiosuchus model shown above is part of the Wild Safari Prehistoric World model collection, replicas of marine crocodiles are quite rare, to learn more about this model series and to view the range at Everything Dinosaur: Safari Ltd: Wild Safari Prehistoric World”

The authors of the scientific paper, published in the “Journal of Systematic Palaeontology” conclude that if this new species is a sister taxon to Geosaurus, this places it in the Geosaurini clade and this data suggests that the major Geosaurini lineages originated millions of years earlier than previously thought.

Lead author Davide Foffa (School of GeoSciences at the University of Edinburgh), stated:

“It’s not the prettiest fossil in the world, but the Melksham Monster tells us a very important story about the evolution of these ancient crocodiles and how they became the apex predators in their ecosystem.  Without the amazing preparation work done by our collaborators at the Natural History Museum, it would not have been possible to work out the anatomy of this challenging specimen.”

Prehistoric Marine Crocodile on Patrol – Plesiosuchus manselii

Marine crocodile (Plesiosuchus).

Plesiosuchus manselii illustrated.  A typical metriorhynchid.

Picture Credit: Fabio Manucci/University of Edinburgh

5 10, 2017

Thailand’s Biggest Dinosaur Discovery Reported

By | October 5th, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Fossils of Biggest Dinosaur Found to Date in Thailand Reported

Everything Dinosaur has received reports that news sources are stating that fossils of a very big dinosaur, a Sauropod, have been found in Thailand.  The first dinosaur bone from Thailand was discovered back in 1976, since then, as the country’s geology has been mapped and explored, a number of exciting dinosaur fossil discoveries have been made, mostly by employees of the Department for Mineral Resources, which is part of the Ministry for Natural Resources and the Environment.  Thailand has quite extensive Mesozoic-aged exposures from both marine and non-marine environments.  To date, team members think that the largest dinosaur known from Thailand would be Phuwiangosaurus (P. sirindhornae), which is estimated to have reached a length of about twenty metres and weighed as much as seventeen tonnes.

The First Every Dinosaur Fossil from Thailand

Partial Sauropod femur (Thailand)

The distal end of a Sauropod femur.

Picture Credit: Department of Mineral Resources (Thailand)

The photograph above shows the first dinosaur fossil to have come to the attention of science found in Thailand.  The distal end (the part furthest away from the body) of a femur was found eroding out of a stream bed in 1976.  Since then, a number of dinosaur genera have been named and described including an Iguanodont (Sirindhorna khoratensis) and two sizeable Theropods (Siamotyrannus isanensis and Siamosaurus suteethorni).

A senior government official (Niwat Maneekut, deputy director-general of the Department of Mineral Resources), is reported to have said that the fossils come from the north-east of the country.  A single fossilised bone was found by a villager in the Nong Bua Raheo district of  Chaiyaphum province, around two hundred miles north-east of the capital Bangkok, last year, but more recent excavations led by palaeontologists from the Department of Mineral Resources had recovered a further twenty pieces of bone.

Information remains patchy, but the fossils are estimated to be around 100 million years old and scientists are conducting more research.

Phuwiangosaurus is Believed to be a Member of the Euhelopodidae and Therefore Similar to Euhelopus

Scale drawing - Euhelopus.

Euhelopus scale drawing.

Picture Credit: Everything Dinosaur

3 10, 2017

Squid the Last Meal of a Baby Ichthyosaurus

By | October 3rd, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|1 Comment

Baby Ichthyosaurus communis Dined on Squid

A team of UK-based scientists have identified the youngest and therefore the smallest specimen of Ichthyosaurus communis known to science and, just for good measure, they have found what could have been the marine reptile’s last meal.  Inside the body cavity of the seventy-centimetre-long fossil, the researchers found tiny “hook-like” structures, these are the less digestible parts of squid and therefore, the scientists were able to deduce that this young Ichthyosaurus had recently fed on cephalopods.

A Young Ichthyosaurus communis Attacking a Prehistoric Squid

A neonate Ichthyosaurus communis feeding on a squid.

A neonate Ichthyosaurus attacks a squid.

Picture Credit: Julian Kiely

The artist Julien Kiely has kindly reconstructed the new-born in this fantastic scene, which depicts the moment a newly born Ichthyosaurus communis attacks a squid.

Commenting on the significance of this discovery, one of the authors of the scientific paper, published today in the journal “Historical Biology – The International Journal of Paleobiology”, Dean Lomax stated:

“It is amazing to think we know what a creature that is nearly 200 million years old ate for its last meal.  We found many tiny hook-like structures preserved between the ribs.  These are from the arms of prehistoric squid.  So, we know this animal’s last meal before it died was squid.”

From the Biggest to the Smallest

University of Manchester palaeontologist Dean Lomax, in collaboration with German colleagues, had recently published a paper describing the largest specimen of Ichthyosaurus communis, a female that turned out to be pregnant when she died.  Everything Dinosaur wrote an article about the research in August*, as well as having described the biggest I. communis, just a few weeks later, this new paper, describes the smallest.

Palaeontologist Dean Lomax Holds the Neonate Ichthyosaurus communis Specimen

Dean Lomax holding the neonate Ichthyosaurus fossil.

Palaeontologist Dean Lomax holding the baby Ichthyosaurus fossil.

Picture Credit: University of Manchester/University of Birmingham

*To read the article about the largest Ichthyosaurus communis specimen: Palaeontologists and the Pregnant Ichthyosaurus

Ichthyosaurus communis

Several species of Ichthyosaurus have been identified, but Ichthyosaurus communis was the first, being named and described in 1822 from fossil material discovered by Mary Anning.  These reptiles were viviparous and a number of specimens showing embryos preserved inside their mothers are known.  However, this Ichthyosaurus is one of only a handful of fossils that represent very young animals.  As it was not preserved in association with a larger specimen (the mother) and as there are stomach contents present, it is likely that this fossil represents an independent, recently born animal, the first neonate Ichthyosaurus communis skeleton to be described.

The Ichthyosaurus Fossil on Display at the Lapworth Museum of Geology, University of Birmingham

The neonate Ichthyosaurus communis fossil specimen.

The neonate I. communis specimen.

Picture Credit: University of Manchester/University of Birmingham

The fossil is definitely a new born and not a dwarf species of Ichthyosaur as the scientists noted the large ring of sclerotic bone relative to the eye socket and the poorly ossified (highly cancellous) bones of the skull and other parts of the skeleton, these signs all indicate that these are the fossilised remains of a very young marine reptile.

Niche Partitioning in the Ichthyosauria

The new specimen is from the collections of the Lapworth Museum of Geology, (University of Birmingham).  Palaeontologist Nigel Larkin, a research associate at Cambridge University, cleaned and studied the specimen in 2016,  as he prepared the fossil, he became aware of its potential significance.  Nigel has recently been involved in an extensive restoration project at Biddulph Grange in Staffordshire.  He has been helping to restore the Victorian Geological Gallery at this National Trust property to its former glory.  As one of the most highly respected fossil preparators in the UK, Nigel was able to reveal the fossil’s secrets as he cleaned and helped to preserve the delicate marine reptile skeleton.

To read an article about the Geological Gallery preservation project at Biddulph Grange: Fossil Hunting at Biddulph Grange

The discovery of squid remnants in the gut area suggests these types of Ichthyosaur specialised in hunting cephalopods.  Commenting on the implications of this fossil, Dean Lomax explained:

“This is interesting because a study by other researchers on a different type of Ichthyosaur, called Stenopterygius, which is from a geologically younger age, found that the small – and therefore young – examples of that species fed exclusively on fish.  This shows a difference in prey-preference in new-born Ichthyosaurs.” 

This could hint at niche partitioning, whereby similar species use different resources within an environment to reduce direct competition and to help them co-exist.

Dean Lomax and Nigel Larkin in Front of the Jurassic Seas Exhibit (Lapworth Museum of Geology)

The neonate Ichthyosaurus fossil on display.

Dean Lomax (left) and Nigel Larkin (right) in front of the Lapworth Geological Museum exhibit.

Picture Credit: University of Manchester/University of Birmingham

How Old is the Fossil?

The specimen, part of the vertebrate fossil collection of the Lapworth Museum of Geology, (University of Birmingham), has no provenance data associated with it.  Unfortunately, there were no collection notes or other details to help the palaeontologists to identify where the fossil came from.  However, permission was granted for Nigel to remove a small portion of the matrix surrounding the fossil.  He passed this on to Ian Boomer (University of Birmingham) and Philip Copestake (Merlin Energy, Resources Ltd), so that they could analyse the rock for microscopic fossils.  Based on the types of microfossil preserved, the scientists were able to identify that this Ichthyosaur was around 199-196 million years old, (uppermost Hettangian faunal stage to lowermost Sinemurian of the Early Jurassic).

Nigel outlined the difficulties the team faced:

“Many historic Ichthyosaur specimens in museums lack any geographic or geological details and are therefore undated.  This process of looking for microfossils in their host rock might be the key to unlocking the mystery of many specimens.  Thus, this will provide researchers with lots of new information that otherwise is lost.  Of course, this requires some extensive research, but it is worth the effort.”

In addition, establishing a microfossil signature for a fossil may also help in those cases where theft of fossil material is suspected.

As part of the study, the skeleton was Micro CT-scanned and a three-dimensional digital model was created by Steve Dey of ThinkSee3D Ltd.  Using medical imaging software, Steve converted the three sets of CT cross-sectional images (from scans of the tail, middle section and head) into a single digital three-dimensional model of the whole animal.  This non-destructive technique provided further key information helping to identify the species and potentially, helping to provide new data on Ichthyosaur ontogeny.

The beautiful new-born Ichthyosaurus is on display in the recently refurbished Lapworth Museum of Geology, University of Birmingham, which was nominated for the 2017 Art Fund Museum of the Year.

The scientific paper: “The First Known Neonate Ichthyosaurus communis Skeleton: A Rediscovered Specimen from the Lower Jurassic, UK” by Lomax, D. R., Larkin, N. R., Boomer, S., Dey, S. and Copestake, published in “Historical Biology”.

1 10, 2017

Pterosaur Study Sheds New Light on Jidapterus

By | October 1st, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Jidapterus edentus Gets Grounded

A team of researchers, writing in the on-line, academic, open access journal PLOS One, have published a reassessment of the Early Cretaceous Pterosaur Jidapterus (J. edentus).  This flying reptile, with a wingspan estimated to be between 1.6 and 1.7 metres, is one of a number of flying reptiles known from the Lower Cretaceous deposits of the Jiufotang and Yixian Formations, which between them have helped palaeontologists to build up a detailed picture about life in northern China some 125 million years ago (Jehol Biota).  In this new study, Jidapterus is identified as a valid genus (there had been some doubts raised over whether or not the single fossil specimen known represented another closely related Pterosaur species – Chaoyangopterus zhangi).  In addition, the authors postulate that Jidapterus might have been a ground dwelling forager, Everything Dinosaur team members have speculated that Jidapterus only took to the trees to evade predators or perhaps to roost.

The Only Known Specimen of Jidapterus edentus with an Accompanying Line Drawing

Line drawing and holotype of Jidapterus edentus.

The holotype fossil of Jidapterus edentus and accompanying line drawing.

Picture Credit: PLOS One

Tricky Pterosaur

Named in 2003, Jidapterus is known from a single, partially articulated and nearly complete specimen (holotype RCPS-030366CY).  It is a member of an enigmatic family of Pterosaurs called the Chaoyangopteridae (pronounced Chow-yang-op-tery-rid-aye).  Several species have been named, from Brazil (Lacusovagus) and from Lebanon (Microtuban), to read more about the Lebanese Pterosaur, the first flying reptile to be described from this part of the world: Pterosaur Fossil Flies Home.  Most of what palaeontologists know, about this family of flying reptiles, distantly related to the giant azhdarchid Pterosaurs, comes from studying the fossilised remains of chaoyangopterids from northern China.  Trouble is, these delicate flying reptile specimens associated with Liaoning Province are squashed as flat as a pancake.  The researchers identify a number of anatomical traits (autapomorphies) that reinforce the idea that Jidapterus should be considered as a distinct genus.

In addition, the scientists examined the feet and claws of Jidapterus and concluded that this flying reptile, once thought to have been a piscivore, was probably omnivorous, foraging on the forest floor for seeds and other plant material, as well as snatching up invertebrates and small creatures.  Whether or not the narrow, pointed beak (labelled in the diagram above) was entirely toothless remains open to debate.

The scientific paper: “The Toothless Pterosaur Jidapterus edentus (Pterodactyloidea: Azhdarchoidea) from the Early Cretaceous Jehol Biota and its Paleoecological Implications” by Wen-Hao Wu, Chang-Fu Zhou and Brian Andres published in PLOS One.

30 09, 2017

Strong-armed Sabre-Tooth Kittens

By | September 30th, 2017|Dinosaur and Prehistoric Animal News Stories, Main Page, Photos/Pictures of Fossils|2 Comments

Sabre-Toothed Kittens and Their Strong Arms

A new study undertaken by scientists from California State Polytechnic University, the University of Wisconsin and colleagues at Bristol University, has concluded that Smilodon (S. fatalis), kittens were born with strong arms, stronger than similarly-sized modern big cats.  However, their pattern of bone development was congruent to other members of the Felidae.

Strong Kittens Grew up to be Strong Cats

Sabre-Toothed Cats

The famous “Sabre-Toothed Cat” – Smilodon.  Strong kittens – strong cats.

Picture Credit: BBC

The Treasure Trove of Fossils at La Brea

Using the extensive Smilodon fossil record preserved at the La Brea Tar Pits (Los Angeles, California), the researchers measured the limb bones of these big cats.  Only unbroken limb bones were included in the growth analysis.  Fortunately, given the huge number of Smilodon fossil specimens associated with this natural predator trap, the researchers, which included Donald Prothero, the author of “The Princeton Field Guide to Prehistoric Mammals”, that Everything Dinosaur was invited to review earlier this year* had a substantial data set to study.  For example, the scientists included thirty, Smilodon upper arm bones (humeri) representing cats at various growth stages in this study.  Their ontogenic analysis revealed that young animals had thicker and more robust bones than other members of the cat family (Felidae).  The bones did not become more robust as the cats grew, it seems Sabre-Tooths were born with big, strong arms.

Comparing the Upper Arm Bones of Big Cats Extant and Extinct 

Sabre-Toothed Cats were born with strong arms.

Comparing the humeri of extinct and extant big cats.

Picture Credit: PLOS One/DRP

The photograph shows a comparison of five big cat upper arm bones (the humerus).   The bones come from adult animals and provide a visual guide to the forelimb size of large felids.

From the left – the first, whitish bone is the humerus of a Mountain Lion (Cougar) – Puma concolor.  The second, whitish bone is the humerus from a Tiger, Panthera tigris.  The Tiger is a much bigger and heavier than the Mountain Lion.  The bone in the middle is the humerus of Smilodon fatalis, it is much thicker and more substantial.  The third whitish bone comes from a Lion Panthera leo.  The dark bone on the far right, comes from an extinct species that was contemporaneous with Smilodon.  This is the humerus of an American Cave Lion (Panthera atrox), the P. atrox bones used in the study also came from La Brea Tar Pits.

How Did the Limb Bones of Smilodon fatalis Change as the Cats Aged?

The research team discovered that whilst the arm bones of Smilodon, were more robust than those or extant big cats, they did not become more robust as the cats got older.  Smilodon kittens had big limb bones to begin with.  Mapping the bone growth (ontogeny), using the many specimens representing animals of different ages from the La Brea fossil collection, the team found that Smilodon grew in a similar way to other, primitive members of the Felidae and in the same way that many living cat species do today.  The bones lengthen and become more slender before they thicken.  This study, published in the on-line, open access journal PLOS One suggests that Felidae growth and development is much more constrained than previously thought, even in genera with very different morphotypes and bone structures.

Comparing the Radii of Big Cats (Living and Extinct)

Smilodon Limb Growth Study.

Comparing the radius of extinct and extant cat species.

Picture Credit: PLOS One/DRP

The photograph (above) shows the radii of the five species of big cat, laid out in the same order as the photograph which showed the humeri.  The radius is one of a pair of bones found in the forearm, it is the bone that is lateral to the body (facing the outside).

Left to Right:

  • Mountain Lion (Puma concolor)
  • Tiger (Panthera tigris)
  • Sabre-Toothed Cat (Smilodon fatalis)
  • African Lion (Panthera leo)
  • American Cave Lion (Panthera atrox)

Professor Prothero stated:

“Sabre-Tooth cats have extraordinarily strong front limbs for tackling and subduing prey before they slashed their throats or bellies with their sabre-like canine teeth.  Using the extraordinary collection of limb bones of Sabre-tooth kittens at La Brea, we found that their limbs don’t become more robust as they grew up, but instead retain the stereotypical growth pattern where the limbs grow longer more quickly than they grow thick.  To compensate, Sabre-tooth kittens were born with unusually robust limbs and retained that pattern as they grew.”

The limb measurements demonstrated that Smilodon fatalis kittens had the same growth curve graph as those of Tiger or Mountain Lion kittens, but they tended to be thicker from the outset.  For the same length of bone, the Sabre-Tooth kitten forelimb element (radius or humerus) always had a larger circumference than a comparably sized Mountain Lion or Tiger.

A Comparative Analysis of the Tibia of Smilodon (S. fatalis) Different Growth Stages

Smilodon tibia comparison.

Comparing the size of Smilodon leg bones (tibia).

Picture Credit: PLOS One/DRP

* Everything Dinosaur’s review of “The Princeton Field Guide to Prehistoric Mammals” by Donald R. Prothero: Field Guide to Prehistoric Mammals – Book Review

The scientific paper: “Did saber-tooth kittens grow up musclebound?  A study of postnatal limb bone allometry in felids from the Pleistocene of Rancho La Brea” by Katherine Long, Donald Prothero , Meena Madan, Valerie J. P. Syverson published in PLOS One.

28 09, 2017

New Basal European Ornithopod Described

By | September 28th, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Burianosaurus augustai  – Unappreciated Ornithopods

If you were able to book yourself onto a time-travelling safari to the Cretaceous, before journeying into the long distant past, you might explain to the travel guide that you would be hoping to spot a Tyrannosaur, get up close to a browsing armoured dinosaur or possibly take some photos of Triceratops.  However, we suspect, that even if such a venture was possible, few tourists would spare a thought for one group of dinosaurs, that ironically, you would be much more likely to encounter.  These are the Ornithopods, that diverse and extremely successful group of bird-hipped dinosaurs, that are often overlooked.  A new basal Ornithopod has been named and described this week – Burianosaurus augustai.  A plant-eating dinosaur named after the palaeoartist Zdeněk Burian, who, in his lifetime did much to raise the profile of the Dinosauria.

An Illustration of Burianosaurus (B. augustai)

Burianosaurus augustai illustrated.

An illustration of the basal Ornithopod from the Czech Republic – Burianosaurus augustai.

Picture Credit: Edyta Felcyn

The Dinosaur Equivalent of Antelopes

They lacked horns, body armour and for the majority, they did not reach huge sizes, but these herbivores would have made up a significant component of the dinosaur fauna in most Cretaceous ecosystems.  If you were to go on a safari to the Maasai Mara of Kenya or the Serengeti of Tanzania, tourists might be keen to spot lions, leopards and elephants but in all likelihood, you would encounter a great many different types of antelope.   Dinosaurs like the newly described Burianosaurus can be considered as being the dinosaur equivalent of today’s antelopes.

Described from a single, well-preserved, left femur (thigh bone), Burianosaurus is the first dinosaur to be named from fossils found in the Czech Republic.  It is not the first dinosaur fossil from the Czech Republic to be scientifically described, that honour goes to a single, broken tooth from an indeterminate Theropod from Upper Jurassic sediments that was described in 2014, coincidentally by the lead author of the paper describing Burianosaurus, Daniel Madzia (Polish Academy of Sciences).

The Fossilised Thigh Bone of Burianosaurus (Various Views)

Specimen number NBP oB 203 (Burianosaurus left femur)

Views of the left femur, the only fossil from which the basal Ornithopod Burianosaurus augustai has been described.

Picture Credit: The Journal of Systematic Palaeontology

The photograph (above), shows various views of the left femur of Burianosaurus.  This is the holotype fossil (NMP Ob 203), from which this genus was described.  It is not common these days, to have a new dinosaur genus erected on the description of a single bone.  When this fossil was first studied back in 2005, it was assigned to the iguanodontids.  However, over recent years the Iguanodontia and their relatives have been subject to phylogenetic reassessment and many of the taxonomic relationships between different components of the Ornithopoda have been revised.  The single bone was preserved in such fantastic condition, that its shape and muscle scars proved crucial in assigning a new dinosaur genus.

The views of the femur are (A) a view from the front, (B) viewed from the back, (C) a medial view (the bone viewed from the side closest to the body, think of it as the “inside leg view”) and (D) a lateral view, the bone viewed from the side of the bone towards the outside of the body.  Photographs (E) and (F) are views of the bone from the top looking down (proximal) and from the bottom of the bone looking up (distal).

The scale bar is 10 centimetres and the white arrow in (A) indicates the site from which a small sample of fossil bone was taken to permit an internal examination of bone structure to take place.  This histology helped the research team, writing in the Journal of Systematic Palaeontology, to identify this specimen as coming from a young, adult animal.

Bigger than Hypsilophodon (H. foxii)

A lot of work has recently been undertaken in a bid to better understand how different Ornithopods were related to each other.  These dinosaurs are characterised by their small, quite triangular heads, large orbits (eye sockets) and relatively primitive dentition (at least when compared to their relatives that comprise the Ankylopollexia clade – more derived Iguanodonts, Camptosaurs and the duck-billed dinosaurs).  Their front limbs tended to be much shorter than their hind limbs, so these dinosaurs were probably bipedal, although capable of dropping onto all fours if needed.  Burianosaurus has been depicted as being very similar to Hypsilophodon (H. foxii), to which it was related.  However, the largest H. foxii thigh bone that we at Everything Dinosaur are aware of, is only about half the size of the holotype of B. augustai.  Based on this we estimate that Burianosaurus was around four metres long.

Size Estimate Burianosaurus Compared to Hypsilophodon

Hypsilophodon and Burianosaurus size comparison.

An approximate size comparison between Burianosaurus and Hypsilophodon (H. foxii).

Picture Credit: Everything Dinosaur

Honouring Burian and Augusta

The genus name honours the famous palaeoartist Zdeněk Burian (1905–1981), whilst the species name refers to the influential palaeontologist and author Josef Augusta (1903 – 1968), who between them, did much to popularise the study of prehistoric animals.  Like Burianosaurus, both Burian and Professor Augusta came from the Czech Republic.  The single fossil bone that represents this new genus (the thigh bone), was found in the Korycany Beds of the Peruc-Korycany Formation.  These are a series of marine deposits laid down in a shallow sea, close to land during the Cenomanian faunal stage of the Late Cretaceous.  Team members at Everything Dinosaur estimate that Burianosaurus lived around 95 million years ago.

In the scientific paper, the researchers carry out  a series of phylogenetic analyses of Ornithopod data and as a result, B. augustai is classified as a basal Ornithopod, however, quite how the Ornithopoda is configured remains open to debate.  If you do ever get the chance to participate in a time-travelling safari to the Cretaceous, look out for these fast-running, bipeds, fossils of which are just as valuable to science as that of any other dinosaur.

The scientific paper: “A Basal Ornithopod Dinosaur from the Cenomanian of the Czech Republic” by Daniel Madzia, Clint A. Boyd and Martin Mazuch published in the Journal of Systematic Palaeontology.

12 09, 2017

Europe’s Newest Brachiosaur

By | September 12th, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Soriatitan golmayensis of the Lower Cretaceous of Spain

Say hello to Europe’s newest member of the Brachiosauridae family – Soriatitan golmayensis, a Sauropod estimated to have been longer than a badminton court!  This new species of herbivorous dinosaur has been described in a scientific paper published in the journal “Cretaceous Research”.  The fossil material, consisting of a single tooth, elements from the hips, limb bones including a partial femur and fragmentary tail bones were excavated over several years from the turn of the Century.  The study of the fossil material finally culminating in the establishment of a new species of brachiosaurid.  The genus name means “Soria Titan”, a reference to Soria Province in central Spain where the fossils come from.  The species name honours the Lower Cretaceous Golmayo Formation (upper Hauterivian-lower Barremian), from which the fossil material was extracted.

An Illustration of the Newly Described Early Cretaceous Sauropod Soriatitan golmayensis

Soriatitan golmayensis illustrated.

An illustration of the brachiosaurid Soriatitan golmayensis.

Picture Credit: Fundación Conjunto Paleontológico de Teruel-Dinópolis

Approximately Fourteen Metres Long

With less than 15% of the skeleton to work with, the researchers, which included lead author of the paper, Rafael Royo-Torres (Fundación Conjunto Paleontológico de Teruel-Dinópolis/Museo Aragonés de Paleontología, Spain), were able to identify this dinosaur as a Brachiosaur by comparing the bones to better-known species.  To estimate the size, the scientists scaled up the dinosaur based on the dimensions of the 1.25-metre-long humerus (upper arm bone).  When this bone was compared to the humeri of other brachiosaurids the team concluded that their specimen represented a fourteen-metre-long individual.

The Size of Soriatitan Was Calculated Using the Humerus

Fossil humerus (Soriatitan golmayensis).

The humerus from Soriatitan which was used to estimate the animal’s size.

Picture Credit: Fundación Conjunto Paleontológico de Teruel-Dinópolis

The Brachiosauridae Family

Brachiosaurs probably originated in the late Middle Jurassic and survived the break-up of Pangaea before finally becoming extinct in the Early Cretaceous.  Fossils of these long-necked, heavy-limbed plant-eaters are known from North America, Africa, Europe and southern England.  The Brachiosauridae is one of the three groups that make up the larger clade the Titanosauriformes.  The research team estimate that Soriatitan roamed the Iberian Peninsula some 132 million years ago.  Although, other fragmentary fossils notably those of Pelorosaurus conybeari from the Grinstead Clay Formation (West Sussex, England), have been tentatively assigned to the Brachiosauridae, the discovery of Soriatitan is extremely significant.  Dinosaurs such as the similar sized P. conybeari have been found in slightly older strata (Valangian faunal stage of the Early Cretaceous), Soriatitan provides evidence that brachiosaurids persisted in the Early Cretaceous of Europe for longer than previously thought.

Palaeontologist Rafael Royo-Torres explained:

“Until now it was believed that brachiosaurids had become extinct in Europe around 130 million years ago, the discovery of Soriatitan changes our perception of the European Early Cretaceous biota.”

The Break-up of Pangaea

The single, spoon-shaped tooth is typical of a brachiosaurid.  This tooth and the shape of a number of bones such as the presence of middle caudal neural spines helped the researchers to assign this dinosaur to the Brachiosauridae family.  In addition, the team deduced that Soriatitan may have been closely related to Abydosaurus Cedarosaurus and Venenosaurus, which are all known from Lower Cretaceous-aged strata from Utah (United States).   The presence of Early Cretaceous brachiosaurids in both North America and Europe, give support to the hypothesis of a connection between the tectonic plates of these continents at some point during the Early Cretaceous.  A land connection between Europe and North America must have been present to enable closely related dinosaurs to be found in both Spain and the western United States.

Views of the Single Tooth of Soriatitan golmayensis

Soriatitan fossil tooth.

Views of the single tooth of Soriatitan from the Lower Cretaceous of Spain.

Picture Credit: Fundación Conjunto Paleontológico de Teruel-Dinópolis

The discovery of Soriatitan, may help palaeontologists to better understand the evolution of the Titanosauriformes in Europe.  Rafael Royo-Torres was part of the research team that described the non-brachiosaurid Titanosauriform Tastavinsaurus sanzi recovered from a dig site in Peñarroya de Tastavins (Teruel) at the base of the marine Xert Formation in 2008.  It is one of the most complete and best-preserved Sauropod dinosaur skeletons from the European Early Cretaceous.  Tastavinsaurus roamed Spain some 125 million years ago.  The discovery of Soriatitan may help fill the evolutionary gap between Late Jurassic Brachiosaurs and the European Titanosaurs of the Early Cretaceous.

Rafael Royo-Torres Photographed Next to the Partial Femur (Thigh Bone)

The femur (thigh bone) of Soriatitan golmayensis

Palaeontologist Rafael Royo , lead author of the scientific paper examines a Soriatitan golmayensis femur.

Picture Credit: Fundación Conjunto Paleontológico de Teruel-Dinópolis

6 09, 2017

Evidence for Communal Roosting in Oviraptorids

By | September 6th, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Communal Roosting in the Dinosauria

Attendees at the annual meeting of the Society of Vertebrate Palaeontology (SVP) in Calgary (Alberta, Canada), were treated to a presentation outlining the discovery of a trio of young oviraptorid dinosaurs that may have been preserved sleeping as a group.  This might provide the first evidence of communal roosting, a practice seen in many extant animals today, where members of the same species sleep together for mutual protection and to help keep themselves warm.  Communal roosting is seen in many species of birds, notable examples being starlings and rooks.  Communal roosting is also known amongst primates, bats and butterflies.

Although, it is easy to misinterpret fossils of this nature, oviraptorids, members of the Maniraptora clade of dinosaurs which are closely related to Aves (birds), are believed to have been social animals and a spokesperson for Everything Dinosaur stated that behaviour of this nature is within the “realms of expectation for these dinosaurs”.

The Fossilised Remains of Three Oviraptorid Dinosaurs – Is this Evidence of Communal Roosting?

Block containing three oviraptorid fossils.

The three oviraptorid fossil skeletons within the single block.

Picture Credit: Gregory F. Funston

The picture above shows the plaster-jacketed block containing the three individuals and a line drawing showing the location of each skeleton and the layout of the bones.  Greg Funston (University of Alberta), who led the fossil study explained that the three sleeping dinosaurs were probably relatives, perhaps from the same brood.  The fossil material first came to the attention of academics when Mongolian customs officials seized the specimen at an airport in 2006.  The stone block was being illegally smuggled out of the country, sadly, there is a thriving black market in illicit fossils from Mongolia and China, despite the very best attempts of the authorities to stop this trade.

Identifying the source of such illegally acquired fossils is always tricky, but a geochemical analysis of the surrounding matrix by scientists from the University of Bologna (Italy), led by Federico Fanti, suggested that the fossil came from the Bugiin Tsav area of the Gobi Desert (Upper Cretaceous sediments associated with the Nemegt Formation – Maastrichtian faunal stage).  Dr Fanti has also presented his findings at the SVP.

Sleeping Oviraptorids

Oviraptorids were extremely bird-like, feathered dinosaurs, with short skulls, beaks and deep lower jaws which were largely edentulous (lacking teeth).  Several genera have been named and these dinosaurs lived in the northern hemisphere during the Late Cretaceous.  Most of these dinosaurs were relatively small, around two-three metres in length (Gigantoraptor being an exception) and they were particularly abundant in Asia.  Fossils of their nests have been found, along with adults incubating eggs.  Most palaeontologists believe that these dinosaurs were social animals with similar behaviours to those seen in extant birds.  The diet of oviraptorids is uncertain, these bipeds could have been mainly herbivorous, but omnivory and durophagy (eating hard-shelled items like nuts, seeds and molluscs) is not ruled out.

An Oviraptor Exhibit at a Museum (Frankfurt Natural History Museum)

An Oivraptor fossil with nest.

An Oviraptor dinosaur sitting on her nest.

Picture Credit: Everything Dinosaur

The three individuals are from the same species, which is new to science, these oviraptorids have yet to be formally named.  Like several other oviraptorids, a prominent, domed skull crest has been identified.  These types of dinosaurs seem to have been highly successful, the vertebrate biota of some Upper Cretaceous deposits of China are dominated by oviraptorids, for a case in point: Not Another Ganzhou Oviraptorid

Juveniles Huddling Together

Two of the dinosaurs have been preserved crouched down on their stomachs, these two specimens, which are more complete than the third, have their necks curled back towards their bodies, whilst their arms cradle their heads, this is very reminiscent of a sleeping posture adopted by many types of living bird.  The fossilised remains of allegedly sleeping dinosaurs have been found before, perhaps most notably Mei long from the Liaoning Formation of north-eastern China.  M. long was named in 2004 after a spectacular fossil showing a head tucked under an arm and a tail curled round the body was discovered.  This little troodontid was either resting or sleeping when it was smothered by a layer of volcanic ash.

An Illustration of the “Sleeping Dragon” Mei long

Mei long illustration.

Mei long – sleeping dragon.

This is the first fossil evidence to support the idea that some kinds of dinosaurs roosted together (communal roosting).  Bone histology indicates that these animals were juveniles and roughly the same age when they died, it has been speculated that this fossil represents a “teenage gang” of sub-adult dinosaurs that died in their sleep.  If the layout of the fossils reflects their true posture and the bone position has not been affected by the fossilisation process, then the position of the three dinosaurs implies they were touching each other.  The researchers think the youngsters were probably huddling for warmth.  That suggests that the animals had tried to maintain a constant body temperature, or perhaps they were frightened and huddling together for protection and comfort.  David Varricchio (Associate Professor at Montana State University), has commented that he wondered whether these dinosaurs were resting or taking shelter from harsh weather rather than sleeping.  Funston argues that modern animals that roost together don’t usually make direct contact except for warmth.  Animals that died in events such as floods are preserved in very different positions from that of the oviraptorid trio, making it unlikely that the young dinosaurs were awake when they met their demise.

An Illustration of Roosting Oviraptorids

Communal roosting in oviraptorids.

Roosting oviraptorids.

Picture Credit: Mike Skrepnick

Difficult to Interpret

The three dinosaurs do seem to have perished together, their body positions indicate that the carcasses were unlikely to have been transported far before accumulating and forming this assemblage, but interpreting the fossil is difficult.  Other researchers have expressed reservations about the communal resting hypothesis.  For example, biologist John Grady (Bryn Mawr College, Pennsylvania), has stated that the dinosaurs may have huddled together to hide or merely because the location was “a great place to sleep.” 

However, this fossil material is interpreted, it adds to the growing body of evidence that many types of dinosaurs, including Maniraptorans were highly social creatures and capable of exhibiting quite complex behaviours.

For a 2013 article that looks at evidence for oviraptorid courtship displays: Dinosaurs Shaking Tail Feathers and Strutting

Canadian dinosaur helps to prove dinosaurs were show-offs: Fossil Discovery Reinforces Idea of Dinosaurs Displaying

1 09, 2017

Silky Dinosaur Ruffles Feathers

By | September 1st, 2017|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Serikornis sungei – Feathered but a Terrestrial Dinosaur

A team of international scientists have ruffled a few feathers amongst their fellow palaeontologists.  A new species of feathered, four-winged dinosaur from north-eastern China has been described.  Despite its heavily feathered forelimbs and legs, this forty-eight-centimetre-long Theropod may have been permanently grounded.  Writing in the journal “The Science of Nature”, the scientists, which include lead author Ulysse Lefèvre (Royal Belgian Institute of Natural Sciences in Brussels), describe a basal paravian (member of the Paraves clade of Theropods), it has been named Serikornis sungei.

Potentially a Very Down to Earth Feathered Dinosaur – Serikornis sungei

Serikornis sungei catches a spider.

Serikornis catches a spider.  An illustration of Serikornis sungei.

Picture Credit: Emily Willoughby

Puzzling Paravians and Their Kin

The single, beautifully-preserved and nearly complete fossil specimen of this dinosaur was discovered in 2014.  It comes from the Tiaojishan Formation (Late Jurassic), of Liaoning Province, China, from the same strata that previously yielded another four-winged Theropod Anchiornis (A. huxleyi), which was named and scientifically described in 2009.    These sediments, which are approximately 160 million-years-old (Oxfordian faunal stage), may also have yielded another four-winged, terrestrial Theropod – Aurornis (A. xui).  However, Aurornis poses a problem for palaeontologist as they try to unravel the evolution of feathered flight.  The holotype fossil material of Aurornis was acquired from a fossil dealer, who claimed the fossil came from the Upper Jurassic deposits of Western Liaoning.  However, Pascal Godefroit, a colleague of Ulysse Lefèvre at the Royal Belgian Institute of Natural Sciences, who was the lead author of the scientific paper that described Aurornis, has expressed doubts on the provenance of the original fossil material.  The holotype could have come from the much younger Yixian Formation of Liaoning Province.  Aurornis could have lived at least thirty million years after Anchiornis and Serikornis.  The lack of appropriate and validated fossil documentation is adding to the difficulties faced by scientists as they try and unravel the evolution of flight.

The Beautifully-Preserved Fossil Skeleton of Serikornis sungei

Beautifully preserved Serikornis sungei fossil showing feathers.

Serikornis sungei fossil showing the preserved plumage.

Picture Credit: Ulysse Lefèvre/Royal Belgian Institute of Natural Sciences

“Silky Dinosaur”

The little dinosaur, nick-named “Silky”, because of the silky texture of its integument (covering of feathers), has a skeleton that suggests a terrestrial existence to the researchers.  They propose that Serikornis was a ground-dwelling dinosaur with no adaptations for flight, despite having feathers on its arms and legs.  Yet, feathery legs have been associated with the evolution of flight in the Dinosauria.  A hypothesis has been proposed that one dinosaur lineage went through a four-winged, gliding phase on the way to powered flight.  An example, of which would be the likes of Microraptor, known from Lower Cretaceous-aged deposits from Liaoning.  If a terrestrial dinosaur, such as Serikornis had long feathers on its legs, this suggests that such structures evolved in ground-dwelling dinosaurs and a flight function came secondary.  Such feathery legs might have evolved initially for a different reason, perhaps as a result of sexual selection or as a result of an evolutionary drive to produce even more elaborate and visually stunning displays.  These feathery legs were then inherited by increasingly aerodynamic and arboreal dinosaurs leading eventually to powered flight amongst the Dinosauria.

Palaeontologist Ulysse Lefèvre Examining the Serikornis Fossil Material

Examining the fossilised remains of Serikornis sungei.

Palaeontologist Ulysse Lefèvre views the fossil of Serikornis.

Picture Credit: Ulysse Lefèvre/Royal Belgian Institute of Natural Sciences

Lefèvre and his team named the new species in honour of Sun Ge, the scientist at the Palaeontological Museum of Liaoning who made the fossil available for study, and for the presumed silky texture of its body covering. Serikos means “silk” in ancient Greek.

Contentious Fossil Interpretation

Commenting on one of the reasons for the team’s terrestrial diagnosis for Serikornis, Ulysse Lefèvre stated:

“The feathering of Serikornis shows for the first time a complete absence of barbules—that is, the microstructures that allow feathers to resist air pressure during wing beats.  The plumage is composed of four wings, as with many Theropod dinosaurs from China, but it did not allow “Silky” to take off from the ground or from a tree.”

In the phylogenetic analysis undertaken by the research team, Serikornis is classified as a basal paravian, outside the Eumaniraptora clade, the clade that includes the Deinonychosauria (troodontids and dromaeosaurids), as well as birds.  Whilst these scientists propose a terrestrial habit for Serikornis, some palaeontologists disagree.  For example, Professor Mike Benton (Bristol University), thinks that presence of hind wings would have made life difficult for this little dinosaur.

Professor Benton explained:

“The hind wings would be inconvenient for a ground-runner.  The long feathers on the thigh and calf would be like very elaborate bell-bottomed trousers, rubbing and catching as the animal walked or ran.”

Professor Benton and many other leading academics support the idea that the anatomical arrangement of four wings is a good contender as a transitional stage between gliding and the evolution of powered flight.  The professor added that in his opinion the body plan of Serikornis was:

“a model for the origin of flight, in which little dinosaurs such as Serikornis clambered into trees, perhaps chasing insects and other small tree-dwellers for food.  To escape predators or to get around, they would glide from bough to bough.”

A Close-up of the Feathers on the Hind Legs of Serikornis sungei

The feathers on the hind limbs of Serikornis sungei.

A close-up view of the feathers on the hind legs of Serikornis sungei.

Picture Credit: Ulysse Lefèvre/Royal Belgian Institute of Natural Sciences

A spokesperson from Everything Dinosaur commented:

“The discovery of another Late Jurassic four-winged dinosaur helps to increase our knowledge as to the diversity of the feathered Theropods, it is very likely that feathers first evolved for other purposes, for example, as insulation, for display.   Flight was a secondary function.  However, where Serikornis sungei fits into the bigger picture regarding the evolutionary line that led to direct ancestors of today’s birds is open to debate.”

Lefèvre and his co-authors concede it may have been possible for these light, small dinosaurs to parachute from the trees to the ground.  The plumage of Serikornis could have slowed its descent, but “controlled falling” is a still a long way from flight.  Serikornis had enlarged claws that may have allowed it to climb trees, so this feathered dinosaur could have been at home in arboreal habitats.

To read Everything Dinosaur’s 2009 article on Anchiornis huxleyiOlder than Archaeopteryx! New Evidence of the Dinosaur/Aves Family Tree

To read Everything Dinosaur’s 2013 article on the discovery of Aurornis: A New Contender for the Title of “First Bird”?

Load More Posts