Trinacromerum BW

Trinacromerum bentonianum, a plesiosaur from the Late Cretaceous of Kansas.

Polycotylidae is a family of plesiosaurs from the Cretaceous, a sister group to the elasmosauridae.

With their short necks and large elongated heads, they resemble the pliosaurs, but closer phylogenetical studies indicate that they share many common features with the plesiosauridae and elasmosauridae. They have been found worldwide, with specimens reported from New Zealand, Australia, Japan, Morocco, the USA, Canada, the former states of the USSR and South America.

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