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Platyhystrix
''Platyhystrix'' (meaning "flat porcupine") was a temnospondyl amphibian with a distinctive sail along its back, similar to the unrelated synapsids, ''Dimetrodon'' and ''Edaphosaurus''. It lived during the latest Carboniferous and earliest Permian periods in Texas, about 300 million years ago.
==Palaeobiology==
''Platyhystrix'' may have been preyed upon by larger temnospondyls such as ''Eryops'', or by larger carnivorous reptiles, which were becoming more common and diverse in the drier climate of the Permian. The skull was large and strongly built, with a frog-like face. ''Platyhystrix'' had a compact body, reaching long including the tail, and its short, sturdy legs indicate a mainly terrestrial life.
''Platyhystrix'' appeared rather unusual: the dorsal vertebrae were extraordinarily lengthened, and in life they probably formed a skin-covered sail. This structure was possibly for thermal regulation, as in other animals of similar appearance, such as the pelycosaurs ''Dimetrodon'' and ''Edaphosaurus''. The back of ''Platyhystrix'' was also covered with thick hard plates, similar to those of its near relative, ''Cacops''.〔
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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