Callawayasaurus

Callawayasaurus
Temporal range: Early Cretaceous, Aptian
Skull of Callawayasaurus colombiensis displayed in the Paleontological Museum of Villa de Leyva
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Sauropterygia
Order: Plesiosauria
Family: Elasmosauridae
Genus: Callawayasaurus
Carpenter, 1999
Species:
C. colombiensis
Binomial name
Callawayasaurus colombiensis
(Wells, 1962 [originally Alzadasaurus])
Synonyms

Callawayasaurus is a genus of plesiosaur from the family Elasmosauridae. When the holotype was first described by Samuel Paul Welles in 1962, it was described as Alzadasaurus colombiensis before being moved into its current genus by Kenneth Carpenter in 1999.

History

Callawayasaurus is named in honor of the paleontologist Jack M. Callaway, editor of Ancient Marine Reptiles who, as Carpenter put it, "in his brief career as a vertebrate paleontologist, did much to improve our understanding of marine reptiles." The familiar suffix, -saurus comes from the Greek sauros (σαυρος), meaning "lizard" or "reptile."

Description

Life restoration

Callawayasaurus was a large plesiosaur, with a skull length of 35 centimetres (1 ft 2 in), body length of 7–8 metres (23–26 ft) and body mass of 1.3 metric tons (1.4 short tons). The nares of Callawayasaurus are elongated and positioned over the maxilla, which has 3-5 teeth. The neck contains 56 vertebrae which are relatively short compared to other elasmosaurids. Callawayasaurus fossils have no pectoral bars; in common with other plesiosaurs such as Terminonatator. They also lack postaxial accessory facets.

Another nearly complete skeleton was found to be slightly more robust than the holotype specimen. This subtle change may indicate sexual dimorphism.

Paleoenvironment

The first Callawayasaurus remains were found in the Paja Formation near Leiva, Boyaca Colombia. The specific name for the type, "columbiensis", means "from Colombia". Callawayasaurus are known from the Aptian faunal stage of the early Cretaceous period, which extended from 125 to 112 million years ago.

See also


This page was last updated at 2023-09-17 00:24 UTC. Update now. View original page.

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