All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
24 10, 2019

Reception Children Make Dinosaur Landscapes

By | October 24th, 2019|Early Years Foundation Reception|Comments Off on Reception Children Make Dinosaur Landscapes

Reception Children Make Dinosaur Landscapes

The children in the three Reception classes at Broughton Primary (Flintshire), have certainly enjoyed learning about dinosaurs this term.  A team member from Everything Dinosaur visited the school this morning to deliver three dinosaur and fossil themed workshops to help round off the scheme of work for the first half of the autumn term.

During the visit, our team member was shown some amazing dinosaur landscapes that the children had built.

Children in Class 1 (Reception) have Created a Prehistoric Landscape

The prehistoric landscape built by class 1 (Reception).

Dosbarth 1 (Class 1) had built their own prehistoric landscape.

Picture Credit: Dosbarth 1, Broughton Primary School

The Reception classes have been learning about animals and what they need to keep them safe and happy.  The children created a river to allow the dinosaurs to catch fish to eat.  The river would also provide water for the prehistoric animals to drink.  The plant-eating dinosaurs have plenty of leaves to chew but all the dinosaurs have to be careful as the volcano has erupted and bright red lava is spilling out down its slopes.

Class 1 Children Constructed a Volcano as part of their Dinosaur Landscape Project

A crepe paper volcano built by Reception children.

The volcano, part of the prehistoric landscape created by the Reception class children.

Picture Credit: Dosbarth 1, Broughton Primary School

Class 3 also constructed a home for their dinosaur models.  Their very own version of “Jurassic Park” included a big forest for the dinosaurs to hide in so that they felt safe and a huge cave for them to explore.  The hard hats we provided with the lamps on their front might come in handy when it comes to exploring the depths of the cavern.

The Prehistoric Scene Created by Class 3 (Dosbarth 3)

Reception class 3 and their prehistoric landscape.

The prehistoric scene created by class 3 (Dosbarth 3).

Picture Credit: Dosbarth 1, Broughton Primary School

The Reception classes enjoyed their dinosaur workshops and demonstrated some amazing counting and recall of dinosaur facts during the morning.  We hope they like the dinosaur hokey cokey activity we provided too.

24 10, 2019

First Vertebrates Capable of Walking on Land May Have Never Left the Water

By | October 24th, 2019|Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles|0 Comments

Parmastega aelidae – Hunting Like a Crocodile

A fascinating new paper has just been published in the journal “Nature” that suggests that some of the very first animals with backbones that were capable of terrestrial locomotion may have never left the water.  Instead, these creatures distantly related to animals that walk on land today, including ourselves, hunted rather like extant crocodiles and ambushed animals on the shore.  That is the conclusion of a group of international scientists that have studied the fossils of Parmastega aelidae, a needle-toothed early tetrapod that lived around 372 million years ago.

A Tropical Lagoon 372 Million Years Ago – P. aelidae Hunting Behaviour

Parmastega aelidae life reconstruction.

Sosnogorsk lagoon with Parmastega aelidae hunting behaviour.  The image (above) shows a tropical coastal lagoon at Sosnogorsk in Russia, about 372 million years ago.  The lagoon is inhabited by various kinds of fish, but also by the early tetrapod Parmastega.  One of creatures – which had eyes positioned at the top of their heads – can be seen on the bottom, with another in the foreground diving down from the surface (with bubbles).  A few more are shown in the middle distance resting at the surface with their eyes above the water, and one in the background crawling onto the beach.  In the far distance, a storm is approaching from the sea.  The sediment in which the fossil bones are found seems to have been deposited during a storm event that killed the inhabitants of the lagoon.

Picture Credit: Mikhail Shekhanov for the Ukhta Local Museum

What are Tetrapods?

Tetrapods include all living and extinct amphibians, reptiles, birds and mammals.  They are predominantly terrestrial, although some animals, whales for example, are entirely marine but had land-living ancestors.  Most tetrapods have four limbs, although some such as snakes have lost their limbs, but evolved from four-limbed ancestors.  These types of animals evolved from lobe-finned fishes (Sarcopterygii), during the Middle to Late Devonian.  Recent fossil discoveries have greatly increased the number of tetrapods known from Upper Devonian strata, but most genera are still only described from very fragmentary remains.  Most of what palaeontologists know about this extremely important group of vertebrates is based on the better known and more complete fossil specimens representing Ichthyostega and Acanthostega.

A Life Reconstruction of the Late Devonian Tetrapod Ichthyostega

Ichthyostega life reconstruction.

Ichthyostega – life reconstruction.

Picture Credit: Julia Molnar

A Gap in the Fossil Record

Trouble is, both Ichthyostega and Acanthostega along with the less complete but partly reconstructable genera Ventastega and Tulerpeton date from around 365-359 million years ago (late Famennian age of the Devonian), but palaeontologists have found tantalising fragmentary fossils that are at least ten million years older and the oldest known tetrapod footprints date from nearly 395 million years ago – read about their discovery here: Footprints from a Polish Quarry Suggest Land Vertebrates 35 Million Years Earlier than Previously Thought.

In this newly published paper, the researchers that include Jennifer Clack (University of Cambridge) and Pavel Beznosov (Russian Academy of Sciences), describe Parmastega aelidae, a tetrapod from Russia dated to the earliest Famennian age (about 372 million years ago), represented by three-dimensional material that enables the reconstruction of the skull and shoulder girdle.  The raised orbits, lateral line canals and weakly ossified postcranial skeleton of P. aelidae suggest a largely aquatic, surface-cruising animal.  Phylogenetic analysis supported by Bayesian statistics indicates that Parmastega might represent a sister group to all other tetrapods.

Skull Bones of Parmastega – Numerous Skull Bones Have Allowed Palaeontologists to Reconstruct the Skull

Skull bones of Parmastega.

Diagrammatic images showing the associated bones (in orange) of two individual skulls associated with Parmastega.  Fossil material includes several examples of skull bones from individuals which permitted scientists to reconstruct the skull in great detail.

Picture Credit: Nature

Large, Narrow Teeth and a Crushing Bite – Comparisons with a Crocodile

The fossil material representing several individual animals comes from north-western Russia.  This area in the Late Devonian was a large tropical lagoon on a coastal plain, inhabited by many types of ancient fish including placoderms.  The unusual suite of anatomical features identified in Parmastega include elasticated jaws, slender needle-like teeth and eyes located towards the top of the head so that it could keep a look out for prey whilst remaining almost totally submerged.  These anatomical features are reminiscent to those found in today’s aquatic ambush predators such as crocodilians.

Comparing the Skull of Parmastega to that of a Caiman

Parmastega compared to a Caiman.

The head of Parmastega compared to a modern crocodile.

Picture Credit: Nature

The scientists also discovered that part of Parmastega’s shoulder girdle consisted of cartilage, and its vertebral column and paired limbs could also be made of cartilage, indicating it probably spent most or all its time in water.  The large concentration of the fossil remains also suggests that it may have lived in large groups.

Co-author of the scientific paper, Professor Per Ahlberg (University of Uppsala, Sweden) stated that clues as to the lifestyle of Parmastega were found by analysing sensory canals identified in the fossil bones.  These sensors probably helped Parmastega to detect vibrations in the water, a trait inherited from its sarcopterygian ancestors.

Professor Par Ahlberg stated:

“These canals are well developed on the lower jaw, the snout and the sides of the face, but they die out on top of the head behind the eyes.  This probably means that it spent a lot of time hanging around at the surface of the water, with the top of the head just awash and the eyes protruding into the air.  We believe there may have been large arthropods such as millipedes or ‘sea scorpions’ to catch at the water’s edge.  The slender, elastic lower jaw certainly looks well-suited to scooping prey off the ground, its needle-like teeth contrasting with the robust fangs of the upper jaw that would have been driven into the prey by the body weight of Parmastega.”

Dr Marcello Ruta from the University of Lincoln, a co-author of the paper added:

“These fossils give us the earliest detailed glimpse of a tetrapod: an aquatic, surface-skimming predator, just over a metre in length, living in a lagoon.  The evolution of tetrapods is one of the most important events in the history of backboned animals, and ultimately led to the appearance of our own species.  Early in their history, tetrapods evolved many changes in their feeding strategies, movement abilities, and sensory perception, but many of these are still shrouded in mystery.”

Comparing the Head Morphology of Late Devonian Tetrapods

Late Devonian tetrapods.

Silhouette views of known Late Devonian tetrapods in approximate scale with head shape indicating different ecological niches.  Parmastega aelidae is estimated to be around a metre in length.

Picture Credit: Nature

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

The scientific paper: “Morphology of the earliest reconstructable tetrapod Parmastega aelidae” by Pavel A. Beznosov, Jennifer A. Clack, Ervīns Lukševičs, Marcello Ruta and Per Erik Ahlberg published in the journal Nature.

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