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Trimerorhachis
''Trimerorhachis'' is an extinct genus of dvinosaurian temnospondyl within the family Trimerorhachidae. It is known from the Early Permian of the southwestern United States, with most fossil specimens having been found in Texas (its fossils are very common in the north-central part of the state). The type species of ''Trimerorhachis'', ''T. insignis'', was named by American paleontologist Edward Drinker Cope in 1878. Cope named a second species from Texas, ''T. mesops'', in 1896. The species ''T. rogersi'' (named in 1955) and ''T. greggi'' (named in 2013) are also from Texas, and the species ''T. sandovalensis'' (named in 1980) is from New Mexico.
==Description==
The length of the largest specimens of ''Trimerorhachis'' is estimated to have been almost a metre (3.3 feet) in length. ''Trimerorhachis'' has a large triangular head with upward-facing eyes positioned near the front of the skull. The trunk is long and the limbs are relatively short. The presence of a branchial apparatus indicates that ''Trimerorhachis'' had external gills in life, much like the modern axolotl. The body of ''Trimerorhachis'' is also completely covered by small and very thin osteoderms, which overlap and can be up to 20 layers thick. These osteoderms act as an armor-like covering, especially around the tail. Their weight may have helped ''Trimerorhachis'' sink to the bottom of lakes and rivers where it would feed.
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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