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Exaeretodon
''Exaeretodon'' is a genus of traversodontid cynodont; several species are known, from various formations. ''E. argentinus'', ''E. frenguelli'', and ''E. vincei'' are from the Carnian-age (Upper Triassic) Ischigualasto Formation of Argentina. ''E. major'' and ''E. riograndensis'' are from the Ladinian-age (Middle Triassic) portion of the Santa Maria Formation of Brazil. ''E. statisticae'' is from the Carnian-age Lower Maleri Formation of India.
==Description==
This genus was an herbivore up to 1.8 meters long (5.9 ft), with a specialized grinding action when feeding.
An analysis of the size of the bones of calves collected in Paleorrota concluded that the mother ''Exaeretodon'' had one or two calves, for one pregnancy. Another point of interest is that these cynodonts had deciduous teeth, which is a characteristic of mammals and means that babies could not chew, and required specialized parental care. Only older juveniles had permanent 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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