Puneet Varma

Polycotylidae

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Kingdom  Animalia
Clade  â€ Leptocleidia
Phylum  Chordata
Rank  Family
Superorder  â€ Sauropterygia
Scientific name  Polycotylidae
Higher classification  Plesiosauria
Order  Plesiosauria
Polycotylidae httpsuploadwikimediaorgwikipediacommonsthu
Similar  Plesiosauria, Polycotylus, Dolichorhynchops, Elasmosauridae, Plesiosauroidea

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

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.

Phylogeny

Cladogram after Albright, Gillette and Titus (2007).


Cladogram after Ketchum and Benson (2010).


Below is a cladogram of polycotylid relationships from Ketchum & Benson, 2011.

References

Polycotylidae Wikipedia


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Dolichorhynchops
Elasmosauridae
Plesiosauria
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