The Acestrocephalus acutus lives in the benthopelagic, freshwater environment.
Acestrocephalus acutus was discovered by the famous Amazon explorer Michael Goulding, and reaches a size of up to 10cm or so. It was discovered in 1983 in a stream called igarape do Cinzento on the Rio Itacaiunas in Para state. More
Acestrocephalus acutus is known from the rio Tocantins and rio Tapajós drainages. It is sympatric with A. maculosus and A. stigmatus in the upper rio Tocantins (Fig. 8). Remarks. More