Name: Trinacromerum ‭(‬Three tipped femur‭)‬.
Phonetic: Try-nah-kro-me-rum.
Named By: Cragin‭ ‬-‭ ‬1888.
Synonyms: Ceraunosaurus brownorum,‭ ‬Dolichorhynchops kirki,‭ ‬Dolichorhynchops willistoni,‭ ‬Trinacromerum anonymum,‭ ‬Trinacromerum brownorum,‭ ‬Trinacromerum willistoni.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ Plesiosauria. Polycotylidae.
Species: T.‭ ‬bentonianum‭ (‬type‭)‬,‭ ‬T.‭ ‬kirki,‭ ‬T.‭ ‬lafquenianum.
Diet: Piscivore/Carnivore.
Size: 3‭ ‬meters long.
Known locations: Canada‭ ‬-‭ ‬Manitoba.‭ ‬USA‭ ‬-‭ ‬Colorado,‭ ‬Kansas,‭ ‬Texas and Utah.
Time period: Cenomanian to Turonian of the Cretaceous.
Fossil representation: Multiple individuals.

       Although not as well-known as its more famous relative Dolichorhynchops,‭ ‬Trinacromerum remains one of the best represented polycotylid plesiosaurs in the fossil record.‭ ‬Like its relatives,‭ ‬Trinacromerum was a plesiosaur but one with‭ ‬a much shorter neck and elongated jaws filled with thin needle like teeth.‭ ‬Living in the Western Interior Seaway of the late Cretaceous,‭ ‬Trinacromerum was a predator of fish that used speed and manoeuvrability to capture its prey.‭ ‬In turn Trinacromerum would have likely been targeted by other predators with possible candidates including large pliosaurs such as Brachauchenius.

Further reading
- A plesiosaur from the Upper Cretaceous of Manitoba. - Journal of Paleontology 9(5):385-389. - L. S. Russel - 1935.


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