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Sveltonectes
''Sveltonectes'' is an extinct genus of platypterygiine ophthalmosaurid ichthyosaur known from Ul’yanovsk region, western Russia.
==Description==
''Sveltonectes'' is known from the holotype IRSNB R269, an almost complete three-dimensionally preserved skeleton including partial skull. It was collected in unnamed locality, in Ul’yanovsk, dating to the late Barremian stage of the Early Cretaceous, about 126 million years ago. Another thunnosaur described from the same locality, by Bogolubow (1909), is ''"Ichthyosaurus" steleodon''. It is a nomen dubium that is twice the size and more robust than ''Sveltonectes''.〔
Like some other ophthalmosaurids, ''Sveltonectes'' has a projection on the nasal bone of the skull into the naris, a prefrontal forming part of the margin of the naris and a frontal forming part of the margin of the supratemporal fenestra. ''Sveltonectes'' is unique in that it has small, sharp teeth and numerous other peculiar features such as a very primitive prootic. The distinctive shape of these teeth suggest that it had a different feeding habit than other cretaceous ophthalmosaurids. Within Ophthalmosauridae, ''Sveltonectes'' is most closely related to ''Aegirosaurus''.〔
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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