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Temporal range: Upper Cretaceous
Thalassomedon BW.jpg
Illustration of Thalassomedon
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Sauropterygia
Order: Plesiosauria
Suborder: Plesiosauroidea
Family: Elasmosauridae
Genus: Thalassomedon
Binomial name
Thalassomedon haningtoni

Thalassomedon (meaning "lord of the seas") was a plesiosaur (not a dinosaur, but an extinct marine reptile from the Mesozoic Era that lived in the open oceans and breathed air). Fossils have been found in the USA. The type species, Thalassomedon haningtoni (named by Welles in 1943).

Description[change | change source]

It had a long neck (with 63 vertebrae), a long snout, long, sharp teeth (up to 5 cm long), a short, pointed tail and four flippers. This reptile was about 40 feet (12 m) long; its skull was about 18.7 inches (47 cm) long.