martedì 14 giugno 2016

NEW MILLION YEAR OLD BRITISH SPECIES OF MARINE REPTILE DISCOVERED

A new type of ichthyosaur, an extinct marine reptile alive at the same time as the dinosaurs, has been identified by a Manchester palaeontologist from a fossil found in an old quarry in Nottinghamshire.

ABSTRACT: Un paleontologo dell'Università di Manchester ha identificato un nuovo tipo di ittiosauro, un rettile marino estinto,  da un fossile trovato in una vecchia cava di Nottinghamshire.
La sua proposta? Chiamarlo "Ichthyosaurus anningae", in onore della celebre paleontologa Mary Anning Simili come forma a un delfino o uno squalo, gli Ittiosauri - spesso erroneamente identificati come "swimming dinosaurs'- hanno nuotato nel mare della Terra del Triassico, Giurassico e Cretaceo per milioni di anni. Il fossile è vissuto nel periodo Giurassico - 200 milioni di anni fa - e solo una manciata di specie di ittiosauro sono note far parte di questo periodo, rendendo la scoperta molto significativa.  



Similar-shaped to dolphins and sharks, ichthyosaurs - often misidentified as ‘swimming dinosaurs’ - swam the seas of the Earth for millions of years during the Triassic, Jurassic and Cretaceous periods. The Nottinghamshire fossil is from the earliest part of the Jurassic Period - 200 million years ago - and only a handful of ichthyosaur species are known from this period, making the discovery very significant. It is also the first time a species of this geological age has been found outside of Dorset and Somerset.


Dean Lomax, a palaeontologist and Honorary Scientist at The University of Manchester, examined the specimen after seeing it on a visit to Leicester’s New Walk Museum, which acquired the fossil in 1951, and spotted some unusual features. The specimen is relatively complete, consisting of a partial skeleton including a skull, pectoral bones, limbs, pelvis bones, ribs and vertebrae. However, the bones are disorderly - it appears that the carcass ‘nosedived’ into the seabed before it became fossilised, which may have restricted previous study.



“When I first saw this specimen, I knew it was unusual,” said Dean. “It displays features in the bones - especially in the coracoid (part of the pectoral girdle) - that I had not seen before in Jurassic ichthyosaurs anywhere in the world. The specimen had never been published, so this rather unusual individual had been awaiting detailed examination.”


Dr Mark Evans, palaeontologist and curator at New Walk Museum, said: “Parts of the skeleton had previously been on long-term loan to ichthyosaur specialist and former museum curator Dr Robert Appleby, and had only returned to the museum in 2004 after he sadly passed away. He was clearly intrigued by the specimen, and although he worked on it for many years, he had identified it as a previously known species but never published his findings.”

Dean has named the new species Wahlisaurus massarae in honour of two palaeontologists (Professor Judy Massare and Bill Wahl) who have contributed significantly to the study of ichthyosaurs, and who first introduced Dean to studying them.

“Both Judy and Bill have been tremendous mentors for me. They have significantly contributed to palaeontology, especially the study of ichthyosaurs, and I cannot think of a better way to remember them by naming this new ichthyosaur in their honour. Their names will be set in stone forever, pun intended!”

The specimen is the first new genus of ichthyosaur from the British Early Jurassic to be described since 1986. Thousands of specimens from this time are known, and many of these have been examined - and continue to be re-examined in light of new knowledge and technologies. However, as the specimen is from a practically unknown location for the discovery of ichthyosaurs, any new discovery could be of real scientific significance. This new species is also important for our understanding of ichthyosaur species diversity, and their geographical distribution during the Early Jurassic period.

The research has been published in the Journal of Systematic Palaeontology.

Notes for editors:

The University of Manchester, a member of the prestigious Russell Group, is the UK’s largest single-site university with 38,600 students. It has 20 academic schools and hundreds of specialist research groups undertaking pioneering, multi-disciplinary teaching and research of worldwide significance. The University is one of the country’s major research institutions, rated fifth in the UK in terms of ‘research power’ (REF 2014), and has had no fewer than 25 Nobel laureates either work or study there. The University had an annual income of £1 billion in 2014/15. Visit www.manchester.ac.uk

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