Named By: Kenneth Carpenter - 1999.
Synonyms: Alzadasaurus colombiensis, Callawayosaurus.
Classification: Chordata, Reptilia, Sauropterygia, Plesiosauria, Elasmosauridae.
Species: C. colombiensis (type).
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.
was originally known as a species of Alzadasaurus
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
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.
- Revision of North American elasmosaurs from the Cretaceous of the Western Interior. - Paludicola 2(2):148-173. - K. Carpenter - 1999.