All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
/Dinosaur and Prehistoric Animal News Stories

Fossil finds, new dinosaur discoveries, news and views from the world of palaeontology and other Earth sciences.

15 06, 2019

Don’t Get “Sniffy” About Dinosaur Sense of Smell

By | June 15th, 2019|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page|0 Comments

Tyrannosaurs Had Their Noses in Front When it Came to Sense of Smell

A team of scientists from University College Dublin have built upon the idea put forward in earlier research indicating that many dinosaurs such as Tyrannosaurus rex had an impressive sense of smell.  In a recently published paper, the scientists examined the sense of smell of a wide range of living and extinct archosaurs and concluded that many different dinosaurs had an excellent olfactory sense but the Tyrannosaurs probably had one of the keenest senses of smell amongst the Dinosauria.

New Study Confirms T. rex Had a Powerful Sense of Smell

T. rex dinosaur model

Up close to Tyrannosaurus rex.  It could smell you probably before it could see you.

Picture Credit: Everything Dinosaur

Olfactory Bulb Ratios

The brains of long extinct animals, like most soft tissues, are poor candidates for fossilisation, the size and the shape of an extinct animal’s brain can be inferred by looking at how the skull bones knit together to form the brain case.  It is from this data that the size and the proportion of the brain dedicated to processing sensory data such as the sense of smell can be deduced.  It has been stated in the past that approximately 50% of the brain volume of a T. rex was made up of the olfactory bulb, that part of the brain that processes smells.  Furthermore, in most modern animals, the size of the brain’s olfactory bulb also correlates with how well they can identify odours.  Looking at the ratio between that part of the brain dedicated to processing smells and the size of the entire brain (the olfactory bulb ratio), can also provide evidence as to the ecological niche an animal is likely to have occupied in an ecosystem.

The King of the Tyrant Lizards Top of the Table for Olfactory Abilities Too

T. rex specimen (cast)

Tyrannosaurs had a highly developed sense of smell.

Picture Credit: Everything Dinosaur

For example, a bird that hunts in low light levels using scent to find food, is likely to have adapted to its environment very differently from that of a kestrel that hunts in daylight and uses its keen eyesight to spot its prey.

Writing in the journal “Proceedings of the Royal Society B”, Dr John Finarelli and his colleague Graham Hughes (University College Dublin), used the olfactory bulb ratio in living archosaurs (crocodiles and birds) to infer the strength of smell amongst dinosaurs.

Prior research has shown that the size of the olfactory bulb is related to the number of smell receptor genes in the DNA of a given animal and how much diversity they represent.  Taken together, it is called the olfactory repertoire. In this new study, the researchers used the olfactory repertoire of modern birds and an alligator to estimate the olfactory ability of several types of dinosaurs.  Based on this innovative research, the scientists concluded that T. rex probably had between 620 and 645 genes encoding its olfactory receptors, a gene count only slightly smaller than those in today’s chickens and domestic cats.  Closely related Tyrannosaurs such as Albertosaurus, also had substantial olfactory receptor gene counts.  Tyrannosaurs probably had the best sense of smell amongst the Dinosauria, this in turn can lead to inferences about how these theropods lived and behaved.

For example, Tyrannosaurs were probably able to “sniff out” prey from far away.  They were  able to track down the carcass of another dinosaur and scavenge the corpse.

A Good Sense of Smell Has Many Other Uses in the Animal Kingdom

The researchers hope that this new study will not get drawn into the “T. rex a hunter or a scavenger debate”, the authors stress that a good sense of smell has many other uses other than finding food.  Many animals use scent to mark and define territory, track down a mate, deter rivals and for intraspecific communication.  The University College Dublin scientists also highlighted a shift in scaling of olfactory bulb ratios to body size along the theropod lineage that led to the evolution of modern birds.  The researchers conclude that by combining morphological and genomic data, it can be demonstrated that, while genetic information for extinct taxa is forever lost, it is potentially feasible to investigate evolutionary trajectories in extinct animals.

Amongst Living Vertebrates, It is the Elephant that Tops the Table for the Most Olfactory Receptor Genes

An African elephant model.

An African elephant (Loxodonta).

Picture Credit: Everything Dinosaur

Amongst all living vertebrates, the record for the most olfactory receptor genes lies with the modern elephant, a herbivore with about 2,500 such genes.  With such an exquisite sense of smell, elephants can “count” quantities of food by odour alone.  The researchers looked at a number of different types of dinosaur in their study, sure enough, some plant-eating dinosaurs showed evidence of a greater reliance on smell than some carnivorous dinosaurs.  For example, the Late Cretaceous herbivore Erlikosaurus (E. andrewsi), a theropod but a member of the Therizinosauridae had a greater number of projected olfactory receptor genes than Velociraptor and other predatory dromaeosaurids.

The Research Team Assessed Olfactory Bulb Ratio Compared to Body Mass Amongst Living and Extinct Archosaurs

Olfactory bulb ratios amongst examples of the Archosauria.

Olfactory bulb ratios amongst living and extinct archosaurs.  This new study confirmed earlier research indicating that the Tyrannosaurs had a powerful sense of smell.

Picture Credit: University College Dublin

14 06, 2019

“King of the Trilobites” Discovered in South Australia

By | June 14th, 2019|Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Redlichia rex – Fearsome Predator of Trilobites

A team of scientists have described a new species of trilobite and at around thirty centimetres in length, this new species is the largest member of the Trilobita from Australia to have been described to date.  Writing in the academic publication, the Journal of Systematic Palaeontology, the team consisting of researchers from the University of Adelaide, South Australian Museum and the University of New England describe Redlichia rex and suggest that it probably specialised in attacking and eating smaller trilobites.  It might even have been a cannibal!

Lead author of the research, James Holmes, a PhD student at the University of Adelaide commented:

“We decided to name this new species of trilobite Redlichia rex (similar to Tyrannosaurus rex) because of its giant size, as well as its formidable legs with spines used for crushing and shredding food, which may have been other trilobites.”

A Life Reconstruction of the Newly Described Trilobite Species Redlichia rex

Redlichia rex life reconstruction.

A life reconstruction of the newly described Redlichia rex trilobite.

Picture Credit: Katrina Kenny

Exceptional State of Preservation

The fossil material comes from an exceptional Lagerstätte known as the Emu Bay Shale on Kangaroo Island, South Australia, these sediments represents shallow sea deposits laid down in the  Early Cambrian.  Around fifty different species of trilobite have been described from this location.  Well-preserved, fully articulated specimens from this deposit are known to reach lengths in excess of 25 centimetres, representing one of the largest known Cambrian trilobites.  Until now, all Redlichia specimens from the Emu Bay Shale have been referred to as Redlichia takooensis.

Previous studies recognised considerable differences in exoskeletal shape and morphology among specimens of varying sizes, which were thought to represent different growth stages of the same species (ontogeny).  However, close examination of a large collection of recently acquired specimens shows that this variation actually represents two distinct morphs, interpreted by the researchers as representing a distinct and larger species – Redlichia rex.

PhD Student James Holmes with a Fossil of R. rex

Redlichia rex fossil.

PhD student James Holmes and a fossil specimen of Redlichia rex.

Picture Credit: University of Adelaide

Many of the fossils demonstrated an exceptional state of preservation with soft parts such as the antennae and the legs preserved.  At around 30 centimetres in length, Redlichia rex is almost twice as big as most other Australian trilobites recorded from Cambrian-aged rocks.

Co-study author, Diego García-Bellido, from the University of Adelaide and the South Australian Museum added:

“Interestingly, trilobite specimens from the Emu Bay Shale, including Redlichia rex, exhibit injuries that were caused by shell-crushing predators.  There are also large specimens of fossilised poo (coprolites), containing trilobite fragments in this fossil deposit.  The large size of injured Redlichia rex specimens and the associated coprolites suggests that either much bigger predators were targeting Redlichia rex, such as Anomalocaris – an even larger shrimp-like creature – or that the new species had cannibalistic tendencies.”

Evidence of an Evolutionary Arms Race

The naming of this new species demonstrates the diversity of the marine biota within this ancient sea environment and supports the idea that one of the principle drivers of the “Cambrian explosion” was the evolutionary “arms race” between predators and prey species.  As predators became larger and more efficient hunters, so primary producers and secondary predators developed more effective defences, this in turn led to the evolution of more deadly predator species.

A Fossil Specimen (Redlichia rex)

Redlichia rex trilobite fossil.

A near complete specimen of the large Cambrian trilobite Redlichia rex.

Picture Credit: University of Adelaide

James Holmes commented:

“The overall size and crushing legs of Redlichia rex are a likely consequence of the arms race that occurred at this time.  This giant trilobite was likely the terror of smaller creatures on the Cambrian seafloor.”

Fossils of the amazing Cambrian marine biota including specimens of Redlichia rex are currently on display at the South Australian Museum (Adelaide).

The scientific paper: “The trilobite Redlichia from the lower Cambrian Emu Bay Shale Konservat-Lagerstätte of South Australia: systematics, ontogeny and soft-part anatomy” by James D. Holmes, John R. Paterson and Diego C. García-Bellido published in the Journal of Systematic Palaeontology.

13 06, 2019

Never Smile at a Texan Prehistoric Crocodile

By | June 13th, 2019|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles|0 Comments

Scolomastax sahlsteini – A Fearsome Cretaceous Crocodile Critter

The Woodbine Formation of eastern Texas has provided palaeontologists with another crocodyliform to study.  The strata represent sediments laid down in a river delta system during the early stages of the Late Cretaceous (Cenomanian faunal stage).  The vertebrate fossils found include dinosaurs, turtles, lungfish and several different types of crocodile including the fearsome Deltasuchus (D. motherali), that was named and described in 2017: Deltasuchus – A Dinosaur Crunching Crocodile.

Joining the list of crocodiles known from this location is Scolomastax sahlsteini, a much smaller animal that probably specialised in hunting fish and other small vertebrates.  Its discovery reinforces the idea that there was niche partitioning in crocodyliforms associated with these sediments, that is, each genus focused on catching different types of prey and therefore avoided direct interspecific competition.

A Life Reconstruction of Scolomastax sahlsteini

Life reconstruction - Scolomastax.

Scolomastax a life reconstruction.

Picture Credit: Brenton Adrian (University of Tennessee)

An Insight into the Cretaceous Ecosystem of Appalachia

Scolomastax sahlsteini lived approximately 96 million years ago.  It has been described from a partial jawbone and this species differs from other prehistoric crocodyliforms associated with this fossil location in having a shortened mandible, reduced tooth count, heterodonty (teeth of different shapes), a dorsally expanded surangular and enlarged attachments for powerful jaw muscles.

Scolomastax may have been not much bigger than a dwarf crocodile (Osteolaemus spp.), the smallest living crocodile species, but at around 1.5 metres in length, it had a formidable bite and was probably best avoided.  Writing in the academic journal “The Anatomical Record”, the researchers conclude that Scolomastax may have specialised in eating shellfish, or turtles (durophagous diet).  Scolomastax may even have been an omnivore, supplementing its diet with plant material.  The fossils from this location (the Arlington Archosaur Site), have provided palaeontologists with an insight into the fauna of the eastern part of the North America (Appalachia).

Commenting on the significance of the discovery, one of the co-authors of the scientific paper, Stephanie Drumheller-Horton, a palaeontologist at the University of Tennessee stated:

“People sometimes think that crocs haven’t changed much since the age of dinosaurs, but that just isn’t true.  This little croc has several weird features that make us think it ate hard prey items and maybe even plants. We don’t have anything like it alive in the world today.”

A Geographical Puzzle

Co-author, Associate Professor Alan Turner (Stony Brook University), added:

“S. sahlsteini is part of a group of early croc relatives called paralligatorids.  Most members of this group are from Asia, but we are starting to have a few examples of them from Texas.  This helps us understand how groups were dispersing between Asia and North America prior to the closing of the Western Interior Seaway, the inland sea that split North America in two.”

The genus name means “pointed stake jaw”, whilst the species epithet honours long-time volunteer Arthur Sahlstein, who found the fossil jawbone.  A phylogenetic analysis places this new genus within the Eusuchia, specifically a member of the Paralligatoridae and a sister taxon to Paralligator gradilifrons, which is known from Upper Cretaceous rocks of the Gobi Desert (Mongolia).

Scolomastax sahlsteini extends the record of paralligatorids into the Late Cretaceous (Cenomanian faunal stage) of North America.  The jawbone fossil represents the first appearance of this clade on the poorly known landmass of Appalachia, supporting a biogeographic connection between North America and Asia in the Early Cretaceous prior to development of the Western Interior Seaway.  The authors of the paper conclude that further analysis of the Paralligatoridae family is required in order to determine appropriate phylogeny.

The scientific paper: “An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas” by Christopher R. Noto, Stephanie K. Drumheller, Thomas L. Adams and Alan H. Turner published in The Anatomical Record.

Everything Dinosaur acknowledges the assistance of a press release from the University of Tennessee (Knoxville) in the compilation of this article.

11 06, 2019

Southern North Sea Yields Prehistoric Evidence

By | June 11th, 2019|Dinosaur and Prehistoric Animal News Stories, Geology, Main Page|0 Comments

The First Archaeological Artefacts Found During the Search for Lost Prehistoric Settlements

During May 2019, an eleven-day expedition by European scientists from Belgium and Britain was undertaken to explore three sites of potential geological and archaeological interest in the southern North Sea.  Through chance finds by fishermen over many decades, it has long been suspected that the southern North Sea hides a vast landscape that once was home to thousands of people.  Over the past two years, the British team has been recreating the drowned landscape using data provided by oil and gas companies, windfarm developers and the coal board.  The modelled landscape contains areas with a higher likelihood of past human activity, locations where evidence for these activities might more likely be found.

To read an early article that highlighted this research: The Search for Lost Prehistoric Settlements in the North Sea

Prospecting this drowned landscape in search of the evidence of people is a challenging activity, as the North Sea is not only one of the busiest seaways in the world but the weather often makes it inhospitable and this work can be dangerous.  Furthermore, multiple utilities cross the area and visibility under water is often very poor.  Given these challenging conditions, researchers on the Belgian vessel, RV Belgica, used acoustic techniques and physical sampling of the seabed to survey three of the high potential target areas.  The team used both traditional geophysical techniques and a novel new technique with a parametric sonar.  This specialised equipment enabled the highest resolution images to be obtained of the deposits beneath the seabed.  Although the survey was heavily impacted by poor weather, confirmation of the occurrence of a well-preserved Early Holocene land surface was made near Brown Bank (Area C in figure below), where several large samples of peat and ancient wood were recovered.  This evidence strongly suggests that a prehistoric woodland once stood in this area.

The Research Team Identified a Prehistoric Woodland

Woodland identified in the Brown Bank area.

Area of woodland identified in the southern North Sea – area C in the figure.  Location of the flint find marked B.

Picture Credit: The University of Bradford (Europe’s Lost Frontiers/VLIZ)

Difficult Weather Conditions Hampered the Research Efforts

Although hampered by the rough seas and bad weather the research team made considerable progress.  Survey over Area B (see figure above), targeted a large river system identified in the model landscape.  This area was focused on a zone where the river entered an ancient sea and was suspected to be a location where evidence of human activity was more likely to be preserved.  The survey recorded not only remains of peat but also nodules of flint which may originate from submarine chalk outcrops near the ancient river and coast.  These findings are supported by the results of vibrocores acquired in the area for the Europe’s Lost Frontiers project.

The Survey Vessel – The RV Belgica

Research vessel RV Belgica.

The research vessel the RV Belgica.

Picture Credit: The University of Bradford

First Archaeological Artefacts

Further study has also revealed the first archaeological artefacts from the survey area.  One was a small piece of flint that was possibly the waste product of stone tool making.  The second was a larger piece, broken from the edge of a stone hammer, an artefact used to make a variety of other flint tools.  As well as being evidence for flint tool production, the hammer fragment derived from a large battered flint nodule would once have been part of a personal tool kit. Research is still ongoing into this artefact and its context within the ancient North Sea landscape.

Laser Scan of the Flint

Laser scan of the flint.

3-D laser scan of the flint, with raked lighting to show surface features.

Picture Credit: Tom Sparrow, Visualising Heritage. University of Bradford

Images of the North Sea Flint

Images of the North Sea flint.

A series of images of the flint (laser scanned and colour photos) .

Picture Credit: Tom Sparrow, Visualising Heritage. University of Bradford

Mapping the Southern River and the Brown Bank

In the relatively short period of time available for survey and sampling around the Southern River and the Brown Bank, the project methodology has clearly demonstrated its value.  Marine geophysics has been used to map the topography of these lost lands and identify areas where prehistoric sediments may exist.  Where these are accessible and are within areas of the landscape that are likely to be attractive for human occupation or use, sediments can be extracted for careful examination and with a higher expectation of making finds than was previously possible.

The material recovered suggests that the expedition has revealed a well-preserved, prehistoric landscape which, based on preliminary inspection of the material, must have contained a prehistoric woodland.  The recovery of stone artefacts not only demonstrate that these landscapes were inhabited but also that archaeologists can, for the first time, prospect for evidence of human occupation in the deeper waters of the North Sea with some certainty of success.  Work will now proceed to refine our knowledge of the larger context of these finds and to plan further expeditions to explore these hidden prehistoric landscapes.

Everything Dinosaur acknowledges the assistance of a press release from the University of Bradford in the compilation of this article.

8 06, 2019

Feathers Came First Then Birds Evolved

By | June 8th, 2019|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles|0 Comments

Feathers Came First Then Birds Evolved

With the discovery of the amazing feathered dinosaur fossils from China, scientists have had to re-think their views about the appearance of dinosaurs, but the story of the evolution of the feather goes more than just skin deep.  In a follow up, to an earlier scientific paper published late last year that examined the evidence for four different types of feather in the Pterosauria, a team of researchers have concluded that the feather arose around 80 million years earlier than the first bird.  Furthermore, the study, led by scientists at the University of Bristol proposes that feathers played a significant role in helping to shape modern terrestrial ecosystems.

Not Just a Flight of Fancy – Feathers Change the Way We Look at Archosaurs

A fossilised feather from the Crato Formation

Numerous isolated feathers have been preserved indicating the presence of Avialae – primitive birds and theropod dinosaurs closely related to birds.  In addition, feather-like structures have been identified in pterosaurs.

Picture Credit: Museu Nacional

Changing Our Understanding of Feathers, Their Function and Role in Evolution

Writing in the academic journal “Trends in Ecology and Evolution”, the researchers develop the work undertaken last year that looked at evidence for feathers in flying reptile fossils from China and utilises techniques deployed in molecular biology to plot the development of integumentary producing genes within the Archosauria.  If feathers did evolve in the Pterosauria as well as the Dinosauria, then this suggests that their common ancestor may have been feathered to.  Feather-like structures probably arose relatively early in the evolution of the Archosaurs.

Lead author of the paper, Professor Mike Benton (Bristol University), commented:

“The oldest bird is still Archaeopteryx first found in the Late Jurassic of southern Germany in 1861, although some species from China are a little older.  Those fossils all show a diversity of feathers – down feathers over the body and long, vaned feathers on the wings.  But, since 1994, palaeontologists have been contending with the perturbing discovery, based on hundreds of amazing specimens from China, that many dinosaurs also had feathers.”

Archaeopteryx – An Early Bird But Not The First Creature to Have Feathers

An illustration of Archaeopteryx.

The first bird – “Urvogel”, the Archaeopteryx but not the first animal to have feathers.

Picture Credit: Carl Buell

Links Between Fish Teeth, Scales, Feathers and Mammalian Hair

Feathers are modified epidermal appendages that consist mainly of horn-like proteins (β-proteins).  Research has identified links at the genetic level between structures in vertebrates associated with shark teeth, dermal scales in teleost fishes, reptilian scales, feathers and mammalian body hair.  The discovery that genes specific to the production of feathers evolved at the base of the Archosauria clade rather than in association with stem members of the Avialae (birds), is supported by fossil evidence in the form of numerous examples of feathered dinosaurs including examples of feathers in Ornithischian dinosaurs as well as the Theropoda.  Many of the authors of this new paper also worked on the study into feathers in pterosaurs published in December last year.

A Genetic Link Between Dermal Coverings in Tetrapods and Teleost Fish Scales

Looking at the orgins of feathers, a link established between integumentary coverings and fish scales.

Fish scales linked to feathers in genome analysis.

Picture Credit: Everything Dinosaur

If feathers evolved before the evolution of flight, they probably arose first as simple monofilament structures most likely to aid the retention of body heat in the archosaurian ancestors of birds and dinosaurs, perhaps first appearing sometime in the Early Triassic, a time after the Permian mass extinction which had led to a massive terrestrial faunal turnover and the evolution of more active animals with upright, erect gaits.

Co-author of the study, Baoyu Jiang from the University of Nanjing (China), added:

“At first, the dinosaurs with feathers were close to the origin of birds in the evolutionary tree.  This was not so hard to believe.  So, the origin of feathers was pushed back at least to the origin of those bird-like dinosaurs, maybe 200 million years ago.  In fact, we have shown that the same genome regulatory network drives the development of reptile scales, bird feathers, and mammal hairs.  Feathers could have evolved very early.”

Pterosaurs Had Feathers

The breakthrough for the research team occurred when two new types of pterosaur from China were studied.  Their pycnofibres showed branching, they did not have monofilaments but tufts and downy-like feathers, this led to the conclusion that members of the Pterosauria had feathers too.

Baoyu Jiang continued: “The breakthrough came when we were studying two new pterosaurs from China.

Professor Benton postulated that this area of research indicates the origins of feathers some 250 million years ago.

The professor explained:

“The point of origin of pterosaurs, dinosaurs and their relatives.  The Early Triassic world then was recovering from the most devastating mass extinction ever, and life on land had come back from near-total wipe-out.  Palaeontologists had already noted that the new reptiles walked upright instead of sprawling, that their bone structure suggested fast growth and maybe even warm-bloodedness, and the mammal ancestors probably had hair by then.  So, the dinosaurs, pterosaurs and their ancestors had feathers too.  Feathers then probably arose to aid this speeding up of physiology and ecology, purely for insulation.  The other functions of feathers, for display and of course for flight, came much later.”

The Importance of Kulindadromeus

Co-author Dr Maria McNamara (University College Cork, Ireland), explained that the discovery of a feathered dinosaur not thought to be closely related to birds has changed the way some palaeontologists view the evolution of feathers.  In 2014, a formal paper was published on a small, bird-hipped dinosaur that was named Kulindadromeus.  Fossils of this small, Siberian herbivore showed that it had skin covered with scales on the legs and tail, but strange, feathery filaments over much of the rest of its body.

The article announcing the discovery of feathers on an Ornithischian dinosaur: Did All Dinosaurs Have Feathers?

A Scale Model of the Feathered Ornithischian Dinosaur Kulindadromeus (K. zabaikalicus)

A scale model of the feathered dinosaur Kulindadromeus.

A 1:1 scale model of Kulindadromeus (Kulindadromeus zabaikalicus)

Picture Credit: T. Hubin/RBINS

Dr McNamara commented:

“What surprised people was that this was a dinosaur that was as far from birds in the evolutionary tree as could be imagined.  Perhaps feathers were present in the very first dinosaurs.”

Fellow co-author Danielle Dhouailly (University of Grenoble, France), studies the development of feathers in baby birds, especially their genomic control.  Her research has demonstrated that modern birds such as chickens often have scales on their legs or necks, these are in fact evidence of reversal, what had once been feathers had reverted to their more ancient form, that of reptilian scales.

This research supports the idea that gene regulatory networks show that the development of scales, feathers and hairs are co-ordinated by a similar set of genes.  Feathers and body hair probably evolved in the Early Triassic with the ancestors of mammals and birds, at a time when synapsids (the lineage of tetrapods that led to mammals) and archosaurs (dinosaurs and birds), show independent evidence of higher metabolic rates.  It was the mass extinction event at the end of the Permian that re-set the evolutionary clock and permitted the evolution of more active land animals, setting terrestrial lifeforms on a course that would ultimately lead to the rise of the dinosaur, volant flight in the Dinosauria and of course the evolution of modern mammals including ourselves.

The scientific paper: “The Early Origin of Feathers” by M. J. Benton, D. Dhouailly, B. Jiang and M. McNamara published in Trends in Ecology & Evolution.

To read our earlier article (December 2018) that examined the evidence for four different kinds of feather-like structures associated with pterosaur fossils: Are the Feathers About to Fly in the Pterosauria?

To read an article from 2015 setting out a counter argument concluding that the majority of the Dinosauria probably did not have feathers: Most Dinosaurs Were Probably Scaly.

7 06, 2019

The Lost Creatures Exhibition – Queensland Museum

By | June 7th, 2019|Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Lost Creatures Exhibition – Queensland Museum

The “Lost Creatures” exhibition at the Queensland Museum (Australia), has been open for more than five years.  Hasn’t the time flown by.  The exhibition opened in December 2013, its aim was to document the amazing prehistoric creatures that once inhabited this part of Australia.  The skilfully designed displays to be found on level two of the museum, took visitors on a journey from around 250 million years ago to more recent times to meet ancient megafauna such as giant monitor lizards, terrifying marine reptiles and of course, dinosaurs.

The “Lost Creatures” Exhibition at the Queensland Museum (Opening Publicity Photograph)

The "Lost Creatures" Exhibition 2013.

Dinosaurs, pterosaurs and other prehistoric animals from Queensland feature in the “Lost Creatures” exhibition.

Picture Credit: Queensland Museum

Recently, Everything Dinosaur has produced a number of articles about Australian dinosaur discoveries, ironically, the most recent articles have featured dinosaur fossil finds, not from Queensland but from New South Wales.

To read about a recently described new Australian dinosaur: Have you Herd of Fostoria dhimbangunmal?

For a second article, published this year about Australian dinosaurs:  A New Australian Ornithopod – Galleonosaurus dorisae.

Queensland’s Long-lost Inhabitants

Commenting on the significance of the exhibition when it first opened the Minister for Science, Innovation, Information Technology and the Arts, at the time, Ian Walker stated:

“Lost Creatures tells an epic story of the struggle to survive and reveals which species survived extinction events in Queensland’s distant past.”

Remains of Armoured Dinosaurs on Display

Australian armoured dinosaur fossil display.

The remains of armoured dinosaurs make up part of the “Lost Creatures” exhibition.

Picture Credit: Queensland Museum

More than a Hundred Fossils on Display

The exhibition consists of more than one hundred fossil specimens which combine with beautiful three-dimensional animal reconstructions and fossil casts to bring Queensland’s prehistoric fauna to life.  Star attractions include the giant lizard Megalania, arguably Australia’s most famous dinosaur – Muttaburrasaurus and remains of ancient prehistoric mammals, some of the giant marsupials that dominated “down under”.

Giant Mammals and the Remains of Prehistoric Reptiles

Giant mammals and marine reptile fossils.

The remains of giant mammals and marine creatures on display.

Picture Credit: Queensland Museum

Exhibition Highlights

Exhibition highlights include remains of the enormous, prehistoric wombat Diprotodon as well as a life-size reconstruction of the hind leg of the sauropod Rhoetosaurus which stands over two metres high.  In addition, more than ninety square metres of the famed Lark Quarry dinosaur trackways are on display along with a video speculating how the numerous dinosaur tracks might have formed.

When this exhibit first opened it was hailed as one of the most comprehensive overviews of Australia’s ancient megafauna, it is pleasing to see that after nearly six years it is still attracting lots and lots of visitors.

5 06, 2019

The Neolithic of West Wales Explored

By | June 5th, 2019|Dinosaur and Prehistoric Animal News Stories, Main Page|0 Comments

University Staff and Students Find Neolithic Artefacts

Staff and students from the University of Wales Trinity Saint David (UWTSD), Lampeter campus have uncovered evidence of New Stone Age activity in western Wales including the discovery of a stone axe that would have been a prized possession some 4,000 years ago.  The stone axe find was made during an archaeological dig at Llanllyr in Talsarn, Ceredigion county.  The dig is part of a programme of undergraduate fieldwork, enabling students to gain “hands on” experience and to practice field techniques.  Excavations have been centred around low mounds surrounded by marshland, areas that are believed to have formed dry ground in the past and as such, they are key places to study for signs of early human habitation.  These “islands” of raised, dry ground appear to have been the focus of activity in the Neolithic period (between four and six thousand years ago), when people left behind traces of their presence in the form of flint tools and other artefacts.

Staff and Students Working at the Archaeological Site

Flint tools found in Ceredigion.

University of Wales Trinity Saint David (UWTSD) – Lampeter campus working at the Neolithic dig site.

Picture Credit:  University of Wales Trinity Saint David (UWTSD)

Trenches Dug to Explore the Deposition of Material

Exploratory trenches were dug at the site and in one, a ground stone axe was discovered.  This rare artefact very probably had a wooden handle when in use thousands of years ago.  The axe would have taken many hours of skilled labour to shape, academics have expressed surprise that such an object was abandoned in this landscape.  The team from the University are also investigating the surrounding area using boreholes to recover samples suitable for reconstructing the ancient vegetation and to provide further data to help date the age of the stone tool finds.

The Flint Stone Axe Found at the Site

The stone axe.

The stone axe with an archaeological ruler for scale.  The chopping face of the axe can be seen on the right.

Picture Credit:  University of Wales Trinity Saint David (UWTSD)

Field Work Experience – An Important Teaching Aid

Joint leader of the dig team, Dr Martin Bates, a geoarchaeologist at the University of Wales Trinity Saint David commented:

“Running an excavation like this is an important part of our teaching here at Lampeter and giving our students the opportunity to gain the skills an archaeologist needs is very important.  When we began our excavations, we did not anticipate finding Neolithic artefacts so this is a bonus for the team.  Hopefully, we can come back next year with a new group of students and continue our investigation of this important piece of Ceredigion’s history.”

Lucky Student

Second-year student Joe Neal was the lucky person who uncovered the stone axe.  The archaeology undergraduate student stated:

“It’s a great find for us, I couldn’t have hoped to find anything better.  This is my first dig and the first time I have found anything, so this is great.”

Dr Ros Coard, Senior Lecturer in Archaeology at UWTSD, added:

“The University of Trinity Saint David has run excavations at the Llanllyr site over a number of years but mostly found later medieval material, so to find a much deeper pre-history is exciting and broadens our understanding of the Aeron Valley and this part of Ceredigion.  It is a most unusual and unexpected find certainly warranting further exploration of the area.”

Everything Dinosaur acknowledges the assistance of a press release from the University of Wales Trinity Saint David in the compilation of this article.

To read about a New Stone Age jawbone with a beeswax filling: Neolithic Dentists.

To read an article about the mapping and recording of high altitude, ancient Stone Age artwork: High Rise Archaeology.

4 06, 2019

Have you Herd of Fostoria dhimbangunmal?

By | June 4th, 2019|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Australia’s Newest Dinosaur Fostoria dhimbangunmal – A Gem of a Fossil Discovery

A team of scientists from the University of New England (New South Wales, Australia), in collaboration with the Australian Opal Centre, have announced the discovery of yet another Aussie dinosaur.  The dinosaur has been named Fostoria dhimbangunmal (pronounced Foss-taw-ree-ah dim-baan-goon-mal) and it has been identified from a series of opalised fossils representing a number of individual animals excavated from an opal mine near Lightning Ridge (New South Wales).

The herbivorous dinosaur, which would have measured around 5-6 metres in length when fully grown, has been classified as an iguanodontid and phylogenetic analysis based on a recently published data set positions Fostoria as the sister taxon to a clade of Gondwanan iguanodontians that includes Anabisetia saldiviai, Talenkauen santacrucensis (both from Argentina) and arguably, Australia’s most famous ornithopod –  Muttaburrasaurus langdoni.

A Life Reconstruction of Fostoria dhimbangunmal

Fostoria dhimbangunmal life reconstruction.

A life reconstruction of a Fostoria dhimbangunmal.

Picture Credit: James Kuether

Evidence of a Herd of Plant-eating Dinosaurs

The fossil material has been opalised and it represents the remains of at least four different animals of different sizes/ages preserved in a monodominant bone bed excavated from the underground opal mine.  Opalised individual fossils of dinosaurs have been found in this part of New South Wales before, but it is remarkable that so many body fossils have been opalised in this case.

Lead author of the scientific paper, published in the  “Journal of Vertebrate Paleontology”, Dr Phil Bell (University of New England), stated that he was stunned by the sheer number of bones that had been found.  He explained:

“We initially assumed it was a single skeleton, but when I started looking at some of the bones, I realised that we had four scapulae (shoulder blades) all from different sized animals.”

Finding these fossils in the same place suggests that these are the remains of a group of dinosaurs that travelled together, as such, this is the first instance of a “herd of dinosaurs” being discovered in Australia.

Fossil Material – Elements from the Forelimb and Shoulder Girdle

Fostoria dhimbangunmal fossil bones (shoulder girdle and forelimb).

Fostoria forelimb and shoulder girdle elements.

Picture Credit: Journal of Vertebrate Paleontology

The picture (above), shows views of a left scapula (A, B and C).  Views of the left humerus (D, E and F) along with views of the left radius (G, H and I), scale bar = 2 cm.

The First Partial Skull of a Dinosaur from New South Wales

Most parts of the body are represented by the fossils, including elements from the skull such as the quadrate and other fossil bones that make up the braincase.  The frontal bones have enabled the researchers to compare the skull roof of Fostoria to other iguanodontids and hypsilophodontids which has helped with classification.

Fossils of Fostoria dhimbangunmal Exposed

In situ - Fostoria dhimbangunmal fossils.

Fostoria dhimbangunmal fossils photographed in situ.  Key (mt) – metatarsal, (is) ischium, (na) neural arches from vertebrae, (fr) unidentified fragment and (dr) dorsal rib.

Picture Credit: Journal of Vertebrate Paleontology

Honouring Robert Foster

The genus name honours opal miner Robert Foster, who discovered the bonebed in the 1980’s.  The species name comes from the language of the Yuwaalaraay, Yuwaalayaay, and Gamilaraay peoples, after the Sheepyard opal field where the bonebed is located.  Scientists and field team volunteers from the Australian Museum in Sydney helped excavate the fossils, but the bones remained unstudied until donated to the Australian Opal Centre by Robert’s children Gregory and Joanne Foster back in 2015.

A View of an Opalised Toe Bone (F. dhimbangunmal)

An opalised toe bone of Fostoria dhimbangunmal.

An opalised toe bone of the newly described dinosaur Fostoria (F. dhimbangunmal).

Picture Credit: Robert A. Smith/Australian Opal Centre

Commenting on the significance of these fossils, palaeontologist and special projects officer, Jenni Brammall of the Australian Open Centre said:

“Fostoria has given us the most complete opalised dinosaur skeleton in the world.  Partial skeletons of extinct swimming reptiles have been found at other Australian opal fields, but for opalised dinosaurs we generally have only a single bone or tooth or in rare instances, a few bones.  To recover dozens of bones from the one skeleton is a first.”

An Important Gondwanan Representative of the Iguanodontians

Although most palaeontologists believe that the iguanodontid dinosaurs were very speciose and diverse during the Early Cretaceous, fossils representing iguanodontids from southern latitudes, what would have been the super-continent of Gondwana, are quite rare.  For example, until Fostoria was described, only one Australian iguanodontid dinosaur – M. langdoni, was known.  Fostoria dhimbangunmal extends the temporal range of these types of dinosaurs in Australia to the Cenomanian (early Late Cretaceous).  It and Muttaburrasaurus are the only iguanodontians known from the eastern margin of the inland sea, the Eromanga Sea, whereas the group is conspicuously absent from the contemporaneous ornithopod-dominated ecosystems of the Australian-Antarctic rift valley in Victoria.

To read about a recent ornithopod addition to the biota of the Australian-Antarctic rift valley: New Australian Ornithopod Described – Galleonosaurus dorisae.

The scientific paper: “Fostoria dhimbangunmal, gen. et sp. nov., a new iguanodontian (Dinosauria, Ornithopoda) from the mid-Cretaceous of Lightning Ridge, New South Wales, Australia” by Phil R. Bell, Tom Brougham, Matthew C. Herne, Timothy Frauenfelder and Elizabeth T. Smith published in the Journal of Vertebrate Paleontology.

30 05, 2019

Two New Theropod Dinosaurs from Thailand

By | May 30th, 2019|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Phuwiangvenator yaemniyomi and Vayuraptor nongbualamphuensis

Two new species of theropod dinosaur have been described from partial fossil remains excavated from strata associated with the Sao Khua Formation of north-eastern Thailand.  It is likely that both these meat-eating dinosaurs have affinities with the Megaraptora and their discovery lends weight to the idea that the Megaraptoridae and their near relatives probably originated in Asia.  The dinosaurs have been named Phuwiangvenator yaemniyomi and Vayuraptor nongbualamphuensis, Phuwiangvenator has been described as a megaraptoran whilst the exact taxonomic position of Vayuraptor remains uncertain, although the authors of the scientific paper suggest that it too was a member of the clade of dinosaurs with long-snouts, highly pneumatised skeletons and with large claws.

Bones in Approximate Life Position from the Right Foot of P. yaemniyomi

Bones from the foot of Phuwiangvenator yaemniyomi.

Bones and claws from the right foot of Phuwiangvenator yaemniyomi with an accompanying line drawing.

Picture Credit: Samathi et al

Lower Cretaceous Carnivorous Dinosaurs

The fossils were found nearly twenty-five miles apart, but the strata in which the fragmentary fossil material was found is contemporaneous and dated to the upper Barremian stage of the Lower
Cretaceous.  The first identified specimens of P. yaemniyomi were found by Preecha Sainongkham, a team member at the Phu Wiang Fossil Research Centre and Dinosaur Museum back in 1993.  The Phu Wiang Mountain region is highly fossiliferous and numerous vertebrate fossils representing the fauna of a low-lying, inland, lacustrine environment have been discovered over the years.  The first dinosaur bone known from Thailand was found in 1976, a scrappy bone fragment that was assigned to the Sauropoda.  This fossil was found by Sudham Yaemniyom, who was at the time a geologist with the country’s Department of Mineral Resources, Bangkok.  The species name of Phuwiangvenator yaemniyomi honours his contribution to the geology and palaeontology of Thailand.

Phuwiangvenator is the larger of the two Theropods, it is believed to have measured around 5.5 to 6 metres in length.  It is known from dorsal and sacral vertebrae plus elements of the hind limbs and feet.  All the fossil material was found within the same bedding plane and within an area of just 5 square metres.

Views of the Right Tibia (A1 – A6) and a Proximal View of the Left Tibia (P. yaemniyomi)

Phuwiangvenator yaemniyomi bones from the lower leg.

Right tibia (A) in various views with a proximal view (B) of the left tibia – Phuwiangvenator yaemniyomi.

Picture Credit: Samathi et al

Vayuraptor nongbualamphuensis – Raptor of the Wind God

The fossils associated with Vayuraptor were found in 1988.  It is known from a left tibia and ankle bones.  The genus name is from the Sanskrit for “Vayu”, a God of the Wind and the Latin term “raptor”, which means thief.  Analysis of the single lower leg bone indicates that like Phuwiangvenator, this dinosaur was a fast-running, cursorial predator.  The fossils of both dinosaurs are now part of the extensive dinosaur fossil collection at the Sirindhorn Museum in Kalasin Province.  This museum houses the largest collection of dinosaur fossil bones in north-eastern Thailand.

Analysis of the Tibia Suggests that Vayuraptor was a Fast Runner

Ankle and lower leg bone Vayuraptor.

Vayuraptor nongbualamphuensis views of the left tibia and ankle (A5 and A6).

Picture Credit: Samathi et al

Megaraptora Originated in Asia

The establishing of at least one of these dinosaurs as a member of the Megaraptora clade, possibly both, helps to support the hypothesis that in south-eastern Asia during the Early Cretaceous, it was the Megaraptora that were diverse and playing the role of apex predators.  This is in contrast to other ecosystems elsewhere in the world, that were dominated by different kinds of theropod dinosaur.  A basal member of the Megaraptora, Fukuiraptor kitadaniensis is known from the Lower Cretaceous (Barremian) of Japan, these two dinosaurs are also (most likely), from the Barremian.  Their identification supports the idea that these fast running, lightly built predators evolved in Asia.

A Model of the Basal Megaraptoran  Clade – Fukuiraptor

CollectA Fukuiraptor dinosaur model.

CollectA Fukuiraptor model.  It is likely that Phuwiangvenator yaemniyomi and Vayuraptor nongbualamphuensis were similar to Fukuiraptor kitadaniensis.

Picture Credit: Everything Dinosaur

An Early Cretaceous Heyday for the Megaraptorans

Fossils of this type of meat-eating dinosaur have been reported from the Barremian to the Aptian faunal stage of the Early Cretaceous.  The authors of the scientific paper, published in the scientific journal “Acta Palaeontologica Polonica”, note that several specimens of megaraptoran dinosaurs have been recorded from the Aptian of Australia and one reported from the later Albian faunal stage of South America.  Megaraptorans are known from the Late Cretaceous but seem to indicate that by around 90 million years ago, “megaraptors” had a more limited range and seem to have been confined mostly to South America.

A Typical Illustration of a Member of the Megaraptoridae Family of Theropod Dinosaurs

Roaming Patagonia 80 million years ago

A leggy, Late Cretaceous carnivore (Murusraptor).  Roaming Patagonia around 80 million years ago.  By the Late Cretaceous the Megaraptoridae may have been less widespread and more provincial.

Picture Credit: Jan Sovak (University of Alberta)

A spokesperson from Everything Dinosaur commented:

“The identification of these theropod remains that had been known about for more than twenty-five years, has been partially resolved.  Hopefully, more fossil material associated with the Vayuraptor genus will be found in Thailand so that it too can be more definitively placed within the Megaraptora clade.  Given the extent of the fossil discoveries made from the Phu Wiang Mountain region thus far, it is highly likely that more new dinosaurs will be named and described from Thailand in the future.”

To read an article about a Late Cretaceous member of the Megaraptoridae family from South America that was reported upon in 2018: A New Member of the Megaraptoridae from the Late Cretaceous of South America (Tratayenia rosalesi)

The scientific paper: “Two new basal coelurosaurian theropod dinosaurs from the Lower Cretaceous Sao Khua Formation of Thailand” by A. Samathi, P. Chanthasit and P. Martin Sander published in  Acta Palaeontologica Polonica.

26 05, 2019

Some Baby Dinosaurs Crawled Before Learning to Walk on Two Legs

By | May 26th, 2019|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Mussaurus Switched from Four Legs to Two

A team of scientists, including researchers from the Royal Veterinary College based in London and Museo de La Plata and National Scientific and Technical Research Council (CONICET) located in Argentina, have collaborated to produce a report on how a Late Triassic sauropodomorph changed as it grew up.  The dinosaur in question Mussaurus patagonicus is an ideal candidate for dinosaur growth studies as it is known from numerous partial to nearly complete skeletons from hatchlings to fully grown adults.  Writing in the academic journal the researchers conclude that Mussaurus could only move on four limbs once born but switched to two legs as it grew up, just as our species switches from all fours to bipedal walking as we grow.

Scientists Looked at How the Centre of Mass Changed in the Body of Mussaurus to Work Out How it Walked

Plotting changes in Mussaurus as it grew.

Mussaurus specimens. (a, b) hatchling, (c) yearling and (bottom) adult.  Scale bars represent 5 cm (a), (b) 15 cm (c) and 100 cm in the adult animal representation.

Picture Credit: Scientific Reports

An Argentinian Sauropodomorph

Fossils of Mussaurus come from southern Argentina, at birth this dinosaur was only a few centimetres in length, but it reached its adult size in around eight years.  Essentially, this dinosaur went from weighing about 60 grams to weighing an estimated 1,300 kilograms with a body length of approximately 8 metres.  The research team conclude that it might have barely been able to walk or run on two legs at the age of one, but would have only committed to being bipedal once it reached adulthood.  This study has implications for the largest terrestrial vertebrates that ever lived as Mussaurus is regarded as an ancestral form of the later sauropods, giants like Apatosaurus, Mamenchisaurus and Giraffatitan, that were to evolve in the Jurassic.

The team scanned key fossils of Mussaurus into three-dimensional models, connected the bones into digital skeletons, and added soft tissue to estimate the shape of the body and its major segments such as head, neck, torso, tail and limbs.  These computer models were then used to estimate the location of the animal’s centre of mass, the point at which all weight can be assumed to act through.  This estimate enabled the scientists to then test whether different models representing different growth stages of Mussaurus patagonicus could have stood on two legs or not, because the centre of mass must be placed under the feet in such poses.

Identifying the Centre of Mass as Mussaurus Grew Up

Mussaurus Locomotion Study

Plotting the ontogeny of Mussaurus (a) hatchling, (b) yearling and (c) adult animal and the subsequent effect on centre of mass and locomotion.

Picture Credit: Scientific Reports

From Four Legs to Two

One of the authors of the scientific paper, Dr Alejandro Otero (CONICET) stated:

“Mussaurus switched from four legs as a baby to two legs by adulthood, much as humans do.  It is important to notice that such locomotor switching is rare in nature and the fact that we were able to recognise it in extinct forms like dinosaurs highlights the importance of our exciting findings.”

Professor John Hutchinson of the Royal Veterinary College, an expert in animal locomotion and co-author of the paper commented:

“We created the first 3-D representation of the major changes of body form and function across the growth of a dinosaur.  And we were surprised to learn that enlargement of the tail and reduction of the neck had more of an effect on how Mussaurus stood than how long its forelimbs were, which is what people used to think.”

Implications for Giant Dinosaurs

At around eight metres in length, Mussaurus was one of the largest dinosaurs in southern South America during the Late Triassic (estimated to be Norian faunal stage), however, during the Jurassic and Cretaceous much larger lizard-hipped dinosaurs would evolve from this lineage.  By improving our understanding about how some of the sauropodomorphs moved this type of research can provide insights into how much bigger plant-eating, long-necked giants walked.  When adult, dinosaurs such as Diplodocus and Brachiosaurus were very much quadrupedal, although it has been suggested that when very young some of these dinosaurs might have been able to rear up onto their hind legs to escape danger.*

Mussaurus Scale Comparison

Mussasaurus scale comparison.

Mussaurus scale drawing compared to an adult human and the skeleton of a typical Late Jurassic sauropod.

Picture Credit: Scientific Reports with additional annotation and information from Everything Dinosaur

* To read an article from 2011 that looked at the research into trace fossils from the western United States that hinted that some very young sauropods may have been able to run on just their hind legs: Facultative Bipedalism in Sauropods

The research team hope to build on this work as they plan to use computer models to replicate in greater detail how Mussaurus may have actually moved, such as how fast it could walk or run.

Everything Dinosaur acknowledges the assistance of a press release from the Royal Veterinary College (London) in the compilation of this article.

The scientific paper: “Ontogenetic changes in the body plan of the sauropodomorph dinosaur Mussaurus patagonicus reveal shifts of locomotor stance during growth” by Alejandro Otero, Andrew R. Cuff, Vivian Allen, Lauren Sumner-Rooney, Diego Pol and John R. Hutchinson published in Scientific Reports.

Load More Posts