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Hypostomus yaku
''Hypostomus yaku'' is a species of South American armoured catfish from the Loricariidae family. It is only known from the Rio Quente, a small thermal stream in the Rio Paranaíba drainage of the upper Paraná basin, Brazil.〔 ''H. yaku'' is unusual when compared to other species of ''Hypostomus'' in that it tolerates warm water up to 34°C and only attains a relatively small size, growing to 70.8 mm SL.
==Taxonomy==
''H. yaku'' can be distinguished from the other members of ''Hypostomus'', some 140 plus species, by the presence, in mature adults, of hypertrophied odontodes arranged randomly along its flanks and caudal peduncle.〔 This characteristic is also found in species of other Hypostominae genera, ''Aphanotorulus'', ''Peckoltia'' and ''Squaliforma'', but can be distinguished by several keys (see Martins et al. 2014).〔 ''H. yaku'' is most similar to two other species found in the same region, ''H. nigromaculatus'' and ''H. paulinus'', but can differentiated by a lack of dark spots (versus presence in ''H. nigromaculatus'') and by smaller adult size (70.8mm SL versus 135mm SL in ''H. paulinus'').〔
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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