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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).〔Albright III, L. B., Gillette, D. D., and Titus, A. L., 2007b. (Plesiosaurs from the Upper Cretaceous (Cenomanian-Turonian) Tropic Shale of southern Utah, part 2: polycotylidae ). Journal of Vertebrate Paleontology, v. 27, n. 1, p. 41-58.〕 }} }} }} }} }} }} Cladogram after Ketchum and Benson (2010). }} }} }} }} }} }} }} }} Below is a cladogram of polycotylid relationships from Ketchum & Benson, 2011. }} }} }} }} }} }} }} }} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「polycotylidae」の詳細全文を読む スポンサード リンク
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