Hoplias microcephalus is a species of trahiras. It is a tropical, benthopelagic freshwater fish which is known to inhabit the São Francisco River in Brazil. Males can reach a maximum length of .
H. microcephalus was originally described by Louis Agassiz in 1829, under the genus Erythrinus. It was listed as a valid species of Hoplias by O.T. Oyakawa in 2003.
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