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Branchiosaurus
''Branchiosaurus'' (Greek for "gill lizard") is a genus of small, lightly built early prehistoric amphibians. Fossils have been discovered in strata dating from the late Pennsylvanian Epoch to the Permian Period. The taxa may be invalid; the material referred to the genus may be juvenile specimens of larger amphibians.〔Andrew R. Milner, "The Tetrapod Assemblage from Nýrany, Czechoslovakia", in Systematics Association Special Volume No.15, "The Terrestrial Environment and the Origin of Land Vertebrates", ed. by A. L. Panchen, 1980, pp.439-496, Academic Press, London and New York〕
This tiny amphibian was very similar to the ''Rachitomi'', differing primarily in size. Other distinguishing characteristics include a cartilaginous, less ossified skeleton and a shorter skull. Clear traces of gills are present in many fossilized samples, hence the name.
Originally thought to have vertebrae distinct from rachitomous vertebrae, it was placed in a separate order named Phyllospondyli ("leaf vertebrae"). Later analysis of growth stages showed increasing ossification in larger specimens, which showed that at lest some of the species was the larval stage of much larger rachitomes like ''Eryops'', while others represent paedomorphic species which retained the larval gills in adulthood.〔Boy, J.A. (1972): Die Branchiosaurier (Amphibia) des saarpfalzichen Rotliegenden (Perm, SW-Deuchland). ''Abhandlungen des Hessische Landesamt, Bodenforschung'' No 65, pp 1-137〕
Distribution is uncertain, though available fossils come from central Europe, most famous of which are the Permian Niederkirchen Beds around Pfalz, Germany.
==References==
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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