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''Microcleidus'' is an extinct genus of sauropterygian reptile belonging to the plesiosauroidea suborder. It was about the size of a medium sized dolphin, reaching a length of . The species has 40 neck vertebrae and a short tail of 28 vertebrae. ==Classification== Species include: ''Microcleidus homalospondylus'' (Owen 1865) and ''Microcleidus macropterus'' (Seeley 1865). ''Occitanosaurus tournemirensis'' (originally ''"Plesiosaurus" tournemirensis''), was named by Sciau ''et al.'' in 1990, based on a nearly complete skeleton of an animal approximately 4 meters (13 ft) long.〔Ketchum HF, Benson RBJ. Global interrelationships of Plesiosaur (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses. Biological Reviews 〕 It was later found to be a species of ''Microcleidus''. The following cladogram follows an analysis by 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「Microcleidus」の詳細全文を読む スポンサード リンク
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