Name: Callawayasaurus ‭(‬Callaway’s lizard‭)‬.
Phonetic: Cal-la-way-sore-us.
Named By: Kenneth Carpenter‭ ‬-‭ ‬1999.
Synonyms: Alzadasaurus colombiensis,‭ ‬Callawayosaurus.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Plesiosauria,‭ ‬Elasmosauridae.
Species: C.‭ ‬colombiensis‭ (‬type‭)‬.
Diet: Piscivore.
Size: Body up to‭ ‬8‭ ‬meters long,‭ ‬Skull‭ ‬35‭ ‬centimetres long.
Known locations: Columbia‭ ‬-‭ ‬Paja Formation.
Time period: Aptian of the Cretaceous.
Fossil representation: Known from a skull and partial post cranial remains.‭ ‬Remains for up to two individuals so far known.

       Callawayasaurus was originally known as a species of Alzadasaurus until Kenneth Carpenter studied the remains and found that they actually represented a new genus.‭ ‬On a related note the type specimen of Alzadasaurus today only exists as a synonym to Thalassomedon and Styxosaurus.‭ ‬Carpenter named the new genus in honour of fellow palaeontologist Jack M.‭ ‬Callaway who is noted for his work on marine reptiles.‭ ‬The species name C.‭ ‬colombiensis means‭ ‘‬from Colombia‭’‬.
       Callawayasaurus is particularly noted for its fifty-six cervical‭ (‬neck‭) ‬vertebrae that are quite short when compared to other elasmosaurid plesiosaurs.‭ ‬Also,‭ ‬Callawayasaurus has no pectoral bars,‭ ‬a feature shared with the elasmosaurid Terminonatator which lived during the late Cretaceous.

Further reading
- Revision of North American elasmosaurs from the Cretaceous of the Western Interior. - Paludicola 2(2):148-173. - K. Carpenter - 1999.


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