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Scalenodon
''Scalenodon'' is a genus of traversodontid cynodont from the Middle Triassic of Africa and possibly Russia. The type species ''S. angustifrons'' was named in 1946 and several other species were named in the following years. Most of the species from Africa are now thought to belong to different genera than ''Scalenodon''.
==History and species==
The first fossils belonging to ''Scalenodon'' were found in the Manda Formation of Zambia and assigned to ''Trirachodon angustifrons'' in 1946. In 1955, the species was given its own genus, ''Scalenodon''. In 1963, a second species called ''S. drysdalli'' was named from the Ntawere Formation in the Luangwa Valley of Zambia. Later that year ''S. drysdalli'' was placed in its own genus, ''Luangwa''. Three additional species, ''S. attridgei'', ''S. charigi'', and ''S. hirschoni'', were named from the Manda Formation in 1972. In 1973, a Russian species of ''Scalenodon'' was named ''S. boreus''. ''S. boreus'' is known from the southern Ural Mountains of Orenburg Oblast.
A 2003 analysis of traversodontid relationships did not find the species of ''Scalenodon'' from the Manda Formation to form a single clade, meaning that many were not referable to the genus. The study suggested that ''S. hirschoni'' had more in common with other traversodontids like ''Luangwa''. ''S. attridgei'' was viewed as a possible synonym of ''S. charigi'', which was also found to be only distantly related to ''S. angustifrons''. ''S. hirschsoni'' was placed in its own genus, ''Mandagomphodon'', in 2013.
''S. angustifrons'' and ''S. boreus'' remain valid species of ''Scalenodon''. While ''S. angustifrons'' is known from partial skulls, teeth, and a lower jaw, ''S. boreus'' is known only from two upper postcanine teeth.
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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