TL;DR: In this article, the internal anatomy of Tuarangisaurus keyesi is described based on new observations and digital reconstruction of its internal anatomy, including stapes, pterygoid overlapping the vomer, medial sulcus on the dorsal surface, parasphenoid-basisphenoid complex covering the ventral surface, and a posteriorly directed process.
TL;DR: In this article, the determination of an elasmosaur specimen found by the inhabitants of the rural area of Villa de Leyva in 1999, on the basis of photographic material of it, was carried out.
Abstract: RESUMEN En los depositos del Cretacico (Aptiano) de Villa de Leyva se han reportado dos especies de plesiosaurios, un pliosaurio Kronosaurus boyacensis Hampe 1992, y un plesiosaurio Callawayasaurus colombiensis (Welles) Carpenter, 1999 (= Alzadasaurus colombiensis Welles, 1962). Se realiza la determinacion de un especimen de elasmosaurio encontrado por los pobladores de la zona rural de Villa de Leyva en 1999 con base en material fotografico del mismo, siendo muy probable que corresponda a la especie Callawayasaurus colombiensis (Welles) Carpenter, 1999. Palabras Claves: Cretacico, Plesiosaurios, Villa de Leyva. ABSTRACT In the deposits of the Cretaceous (Aptian) of Villa de Leyva two plesiosaurs species have been reported, a pliosaur Kronosaurus boyacensis Hampe 1992, and a plesiosaur Callawayasaurus colombiensis (Welles) Carpenter, 1999 (= Alzadasaurus colombiensis Welles, 1962). We carried out the determination of elasmosaur specimen found by the inhabitants of the rural area of Villa de Leyva in 1999, on the basis of photographic material of it. Probably it corresponds to the Callawayasaurus colombiensis specie (Welles) Carpenter, 1999. Key Words: Cretaceous, Plesiosaurs, Villa de Leyva.