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Hemiodontichthys acipenserinus
''Hemiodontichthys acipenserinus'' is the only species of the monotypic genus ''Hemiodontichthys'', a genus of the family Loricariidae of catfish (order Siluriformes).
==Taxonomy==
This taxon is often compared with the morphologically similar ''Reganella depressa''; ''Hemiodontichthys'' has been considered the sister genus of ''Reganella'' on the basis of osteological data. However, the similar external morphology of these two taxa could be interpreted as an evolutionary convergence, as they occupy the same ecological niche. In both, there is a rostrum and the loss of maxillary teeth; these could have evolved independently in different lineages subjected to similar environmental constraints. Considering some of the morphological characteristics of the two species, ''Hemiodontichthys'' is now believed to be part of the ''Loricariichthys'' group, while ''Reganella'' is part of the ''Pseudohemiodon'' group.
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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