The type locality is about 2 m wide brook with clear water, segments with rapids, riparian vegetation and a substrate of stones and rocks; associated with Characidium sp., Neoplecostomus sp. and Trichomycterus sp. .
Vertebrae: 35 - 36. A member of the Astyanax scabripinnis species complex that distinguishes from species outside this complex by having anal fin with 14-18 branched rays and body depth shallow (26.9-29.7% of SL). Differs from other species of the species complex by its shallow body depth (26.9-29.7% SL) and the smaller interorbital width (26.9-30.4% HL) . : fusiform / normal; Cross section: compressed.
Behavioural data for Astyanax Microschemos is currently being reviewed.
Diet information for Astyanax Microschemos is currently being compiled.
Reproduction data for Astyanax Microschemos is currently being compiled.
Freshwater; benthopelagic. Tropical South America: Rio Itapemirim drainage in Espirito Santo State, Brazil.
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