Alexeyisaurus

Ah-lex-e-e-sore-us.
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Lilah Turner

Evolutionary Biologist

Lilah Turner investigates how prehistoric animals adapted to changing environments, offering insights into evolution's mechanisms.

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Name

Alexeyisaurus ‭(‬Aleksei’s lizard‭)‬.

Phonetic

Ah-lex-e-e-sore-us.

Named By

A.‭ ‬G.‭ ‬Sennikov‭ & ‬M.‭ ‬S.‭ ‬Arkhangelsky‭ ‬-‭ ‬2010.‭

Classification

Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Plesiosauria,‭ ‬Elasmosauridae.

Diet

Piscivore.

Species

A.‭ ‬karnoushenkoi‭

Size

Uncertain.

Known locations

Russia,‭ ‬Franz Josef Land‭ ‬-‭ ‬Wilczek Formation.

Time Period

Norian of the Triassic.

Fossil representation

Partial skeleton.

In Depth

       Although Alexeyisaurus was described from partial remains,‭ ‬it seems that further material was actually present at the site of its discovery.‭ ‬Still,‭ ‬the material recovered is enough to suggest that Alexeyisaurus is one of the earliest known elasmosaurid plesiosaurs,‭ ‬the group of plesiosaurs that had proportionately much longer necks than the more‭ ‘‬standard‭’ ‬plesiosaurs.‭ ‬Like others of this group Alexeyisaurus would have been a piscivorous hunter of fish and possibly squid which would have been caught by the mouth which contained long thin teeth,‭ ‬perfectly suited to catching this type of prey.‭ ‬Additionally the presence of a basal elasmosaurid like Alexeyisaurus during the late Triassic not only helps prove that they‭ ‬lived‭ ‬alongside other earlier plesiosaurs,‭ ‬but‭ ‬that they survived the extinction event that marks the end of the Triassic.‭ ‬This was a particularly bad one for oceanic life,‭ ‬and would not be seen on similar level until the end of Cretaceous extinction that saw an end to all of the large marine reptiles,‭ ‬as well as the pterosaurs and dinosaurs.

       Alexeyisaurus was named in memory of the palaeontologist Aleksei Savvich Arkhangelsky.

Further Reading

– On a Typical Jurassic Sauropterygian from the Upper Triassic of Wilczek Land (Franz Josef Land, Arctic Russia). – Paleontological Journal. 44 (5): 567–572. – A. G. Sennikov & M. S. Arkhangelsky – 2010.

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