Polycotylidae
| Polycotylidae Temporal range: Late Cretaceous, 99.5–66.5 Ma |
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| Trinacromerum bentonianum from the Late Cretaceous of Kansas | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Clade: | † |
| Family: |
†Polycotylidae Williston, 1909 |
| Subgroups | |
Polycotylidae is a family of plesiosaurs from the Cretaceous, a sister group to .
With their short necks and large elongated heads, they resemble the pliosaurs, but closer phylogenetic 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.
Cladogram after Albright, Gillette and Titus (2007).
UMUT MV 19965 (from Japan)
Pahasapasaurus (=AMM 98.1.1)
Cladogram after Ketchum and Benson (2010).
QM F18041
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