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Aegirosaurus
''Aegirosaurus'' is an extinct genus of platypterygiine ophthalmosaurid ichthyosaur known from the Late Jurassic and Early Cretaceous of Europe.
==Discovery and species==
Originally described by Wagner (1853) as a species of the genus ''Ichthyosaurus'' (''I. leptospondylus''), the species ''Aegirosaurus leptospondylus'' has had an unstable taxonomic history. It has been referred to the species ''Ichthyosaurus trigonus posthumus'' (later reclassified in the dubious genus ''Macropterygius'') in the past, and sometimes identified with ''Brachypterygius extremus''. In 2000, Bardet and Fernández selected a complete skeleton in a private collection as the neotype for the species ''I. leptospondylus'', as the only other described specimen was destroyed in World War II. A second specimen from the Munich collection was referred to the same taxon. Bardet and Fernández concluded that the neotype should be assigned to a new genus, ''Aegirosaurus''. The name means 'Aegir (teutonic god of the ocean) lizard with slender vertebrae'.
Within Ophthalmosauridae, scientists once believed ''Aegirosaurus'' was most closely related to ''Ophthalmosaurus''. However, many recent cladistic analyses found it is more closely related to ''Sveltonectes'' (and probably to ''Undorosaurus''). ''Aegirosaurus'' lineage was found to include ''Brachypterygius'' and ''Maiaspondylus'' too, and to nest within Platypterygiinae, which is the sister taxon of Ophthalmosaurinae.
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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