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Philydrosaurus
''Philydrosaurus'' is an extinct genus of choristoderan which existed in China during the Early Cretaceous. The type species ''P. proseilus'' was named in 2005. ''Philydrosaurus'' is closely related to the choristodere ''Monjurosuchus'', and both have been placed in the same family Monjurosuchidae. ''Philydrosaurus'' was found from the Jiufotang Formation and is slightly younger than ''Monjurosuchus'', which was found from the Yixian Formation.
==Description==
Distinct ridges cover the prefrontal and postfrontal bones of the skull, distinguishing ''Philydrosaurus'' from related genera. The lower temporal fenestra, usually present as a hole in the back of the skull of choristoderes, is closed by bone in ''Philydrosaurus''. The eye sockets are large and spaced close together, similar to ''Monjurosuchus'' and ''Lazarussuchus''. ''Philydrosaurus'' is considered more basal than these choristoderes because its eyes are not as closely spaced and face laterally rather than dorsally. The skull is similar in shape to that of ''Cteniogenys'', the most basal choristodere. The shortness of the skull and the laterally facing eye sockets likely represent the ancestral condition for choristoderes, but the closed fenestra links the genus with more advanced forms.
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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