Species
Extinct

Alzadasaurus riggsi

subjective synonym of Thalassomedon hanningtoni
Welles 1943
This taxon is considered subjective synonym of of the valid taxon Thalassomedon hanningtoni according to the Paleobiology Database. See the page for Thalassomedon hanningtoni →
Bibliography
Original description
S. P. Welles. 1943. Elasmosaurid plesiosaurs with description of new material from California and Colorado. Memoirs of the University of California 13:125-254