Reptilia - Sauropterygia - Elasmosauridae

Alternative combination: Alzadasaurus colombiensis

Full reference: S. P. Welles. 1962. A new species of elasmosaur from the Aptian of Colombia and a review of the Cretaceous plesiosaurs. University of California Publications in Geological Sciences 44(1):1-96

Belongs to Callawayasaurus according to F. R. O'Keefe 2001

Sister taxa: none

Type specimen: UCMP 38349, a partial skeleton (skull and skeleton lacking distal part sof limbs, ilia, ischia and tail). Its type locality is Loma de la Catalina I, 6km west of Leiva (UCMP loc. V-4540), which is in an Aptian marine siltstone in Colombia.

Ecology: aquatic carnivore