All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
31 05, 2016

Early Cretaceous Crocodile from Brazil Subjected to Shrink Ray

By | May 31st, 2016|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles|1 Comment

Susisuchus anatoceps – Probably a Dwarf Crocodile

A team of Brazilian based scientists have concluded that the Early Cretaceous crocodile Susisuchus (S. anatoceps) may not have been as large as previously thought, writing in the on line, open access journal PLOS One, the researchers suggest that this species may have grown to less than one metre in length.  It had been thought that specimens collected to date represented juveniles but analysis of growth rings preserved in the fossilised bones of one individual, believed to have died when it was around seventeen years old, suggests that this reptile rarely exceeded seventy centimetres in length.

Early Cretaceous Crocodile Subjected to Palaeontologist Shrink Ray

Susisuchus anatoceps scale drawing.

A modified scale drawing of the Cretaceous crocodile Susisuchus.

Picture Credit: University of Queensland with additional annotation by Everything Dinosaur

Originally described in 2003 from a partial skeleton representing an individual whose desiccated carcase probably laid out on an ancient riverbed for some considerable time before eventual burial, Susisuchus anatoceps is known from about ten fossil specimens, which from their small size were all thought to represent young animals.  However, the scientists, which included lead author of the scientific paper Juliana M. Sayão  from the Universidade Federal de Pernambuco (north-eastern Brazil), analysed the internal structures of a two bones (a rib and a bone from the lower front limb – an ulna) from a Susisuchus and concluded that this specimen represented an animal that was a sub-adult and therefore nearly fully grown.  This research suggests that these crocodiles were small bodied and comparable to extant dwarf crocodiles.

The Fossil Specimen Studied Showing Location Where Bone Samples Were Taken and Close up Views of the Bone Structure

Calculating the age of Susisuchus anatoceps.

A close up of the rib and limb bone fragment used to assess the age of a Susisuchus anatoceps crocodile specimen.

Picture Credit: PLOS One

The picture above shows (A) the fossil specimen of Susisuchus (MPSC R1136), which is part of the vertebrate fossil collection of the Museu de Paleontologia da Universidade Regional do Cariri (Santana do Cariri, Ceará State, Brazil).  The scale bar for (A) is five centimetres.  The area in red (marked B) and green (marked C) with arrows (corresponding to rib and ulna respectively) indicate where the cuts were made for the bone sample collection. (B) View of the cross section of the ulna. (C) View of the cross section of the rib.  In the scientific journal the scale bar for B and C is reported as being 5 mm but we suspect that this scale is inaccurate for both photographs.

Susisuchus anatoceps

Fossils of this ancient crocodile come from the Crato Formation of Brazil and indicate that Susisuchus lived around 112 to 100 million years ago.  Similar crocodile fossils have been discovered in Australia suggesting that these types of crocodiles may have migrated using river systems that linked these parts of the super-continent Gondwana.  Although, now known to be small, when it comes to Crocodylomorphs Susisuchus punches way above its weight as it is one of the oldest crocodilians with a dermal skeleton very similar to that seen in extent crocodilians (members of the Eusuchia), comprising a dorsal shield comprising of at least six longitudinal rows of osteoderms (dermal armour).  This suggests that Susisuchus is phylogenetically very close to the origin of Eusuchia – modern day crocodiles, caiman, alligators and gharials.

Susisuchus anatoceps  – On the Road to Modern Crocodylians

The fossilised remains of the ancient crocodile Susisuchus anatoceps.

Susisuchus anatoceps fossil material.

Picture Credit: University of Queensland

Despite the wealth of vertebrate fossil material associated with the Crato Formation, crocodile fossils are relatively rare.  Many palaeontologists believe that the Crato Formation deposits, the majority of which represent a brackish, lagoonal type environment was not the natural habitat of Susisuchus, instead the bodies of animals were washed downstream into the lagoon and therefore the carcase may have travelled extensively before final deposition.  It is probable that Susisuchus lived in freshwater environments further inland and it fed on small fish, molluscs and amphibians.

Comparing the Size of Brazilian Cretaceous and Early Palaeocene Crocodiles

Scale comparison of Brazilian Cretaceous Crocodylomorpha.

Comparative size of Susisuchus anatoceps to other Brazilian Cretaceous and Palaeocene Crocodylomorphs.

Picture Credit: PLOS One

The diagram above shows Susisuchus anatoceps (4) compared to three other Brazilian Crocodylomorphs from the Cretaceous and Early Palaeocene namely:

1).  Baurusuchus salgadoensis a 4.5 metre long terrestrial predator named in 2005 kwon from the Adamantina Formation of Brazil which lived around 90-83 million years ago.

2).  Guarinisuchus munizi a 3 metre long marine crocodile known from the Early Palaeocene.

3).  Mariliasuchus amarali a  one metre long, highly terrestrial crocodile known from the  upper part of the Adamantina Formation indicating a Late Cretaceous age (possibly Campanian or perhaps Maastrichtian faunal stage)

31 05, 2016

Everything Dinosaur to Attend Daresbury Sci-Tech Open Day

By | May 31st, 2016|General Teaching|Comments Off on Everything Dinosaur to Attend Daresbury Sci-Tech Open Day

Everything Dinosaur at the Dino-Zone

Everything Dinosaur has been invited to attend the Daresbury Sci-Tech Open Day to deliver a range of dinosaur and fossil themed educational activities.  The Daresbury Laboratory Public Open Day is taking place on July 9th (a Saturday).  The famous, world-renowned science park will be opening its doors to the public and this year, a wonderful “Dino-Zone” has been added to the list of family attractions.  Everything Dinosaur team members have been asked to take part.

An Opportunity to Learn Lots About Science

Daresbury Sci-Tech Open Day.

Hair raising fun at the Daresbury Sci-Tech Open Day.

Picture Credit: STFC

Daresbury in the county of Cheshire, is home to one of the country’s leading science campuses where top scientists and engineers are based.   As a working science facility, it is not usually open to the general public, however, on the 9th July the campus will be providing visitors with an opportunity to explore, learn and take part in some fun science activities.

Amongst the more than seventy attractions, Everything Dinosaur staff will be inviting members of the public to dig for fossils amongst the gravels of our “Jurassic beach”.  Our fossil experts will be on hand to identify fossil finds and to explain about prehistoric life.

Come on a Fossil Hunt with Everything Dinosaur

Fossil hunting with Everything Dinosaur

Everything Dinosaur Fossil Hunt

Picture Credit: Everything Dinosaur

A member of the Everything Dinosaur team explained:

“Finding fossils and learning about life in the past is fun!  We will have fossil bones, shark teeth, petrified wood, ammonites, belemnites, crinoids, corals, bivalves, brachiopods, all sorts of fossils and if you find something then you can take it home, the start of your very own fossil collection.  Perhaps the Daresbury Sci-Tech Open Day will enthuse the next generation of palaeontologists.”

For more information about this exciting public open day: Daresbury Sci-Tech Public Event

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