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Archegosaurus
''Archegosaurus'' is a genus of temnospondyl amphibian which lived during the Asselian to Wuchiapingian stages of the Permian, around 299-253 million years ago. The remains of this animal, consisting of at least 90 partial skeletons (mostly skulls), have been found in Germany. The name ''Archegosaurus'' was coined by Goldfuss in 1847. ''Archegosaurus'' is a member of Archegosauridae and gives its name to the family.
==Classification==
In 1938, paleontologist Margaret C. Steen described a temnospondyl from the Permian-age Ruprechtice assemblage in northeast Bohemia. Steen named it ''Memonomenos dyscriton'' on the basis of a skull that was narrower than others in the Ruprechtice. It was classified as an anthracosaur, a group closely related to reptiles. Both ''Memonomenos'' and embolomere anthracosaurs had vertebrae that were divided into several parts, including a pleurocentrum and intercentrum. Animals with this type of divided vertebrae were said to be rhachitomous. During the early twentieth century, paleontologists considered rhachitomous temnospondyls to be the descendants of embolomeres, and Steen considered ''Memonomenos'' to be a link between these two groups. Steen also noted that ''Memonomenos'' had large tabular horns, a feature shared with anthracosaurs. Temnospondyls and anthracosaurs were later found to be two distantly related groups, and paleontologist Alfred Romer placed ''Memonomenos'' within Anthracosauria. This placement was accepted until 1978 when ''Memonomenos'' was reassigned to the genus ''Archegosaurus'' and classified as a temnospondyl. ''Memonomenos dyscriton'' became a second species of ''Archegosaurus'', ''A. dyscriton''.
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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