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Marmornectes
''Marmornectes'' is an extinct genus of pliosaurid known from the Bedfordshire of United Kingdom.
==Description==
''Marmornectes'' is known from the holotype BEDFM 1999.201, articulated partial skeleton which preserved the skull. It was collected in 1999 from the ''Sigaloceras enodatum'' ammonoid subzone, of the Peterborough Member, Oxford Clay Formation, dating to the early Callovian stage of the late Middle Jurassic, about 164.7-163.5 million years ago. It was found in the monotypic locality of Quest Pit, east of Stewartby.〔
It was a longirostrine pliosaurid with seven autapomorphies, and is most similar to ''Peloneustes philarchus''. Nevertheless, a cladistic analysis found it to be basal to ''Peloneustes'' and other pliosaurids. An undescribed pliosaurid, NHMUK R2439, found to be the sister taxon of this genus.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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