An undescribed species of
Hypoptopoma from Brazil with location unknown.
Identification points are the barred dorsal fin and
the spotted ventral area. Habitat:
The species of Hypoptopoma typically occur
in streams of slow to moderate current and muddy to
sandy bottom with marginal emergent vegetation.
Sexual Differences: Male urogenital papilla
short and conical, covered by anterior flaplike anus.
Males with patch of tightly arranged small odontodes,
variably covering first to fourth plates of ventral
series, lateral to urogenital papilla. Males with
poorly developed soft-tissue flap along posterior
margin of pelvic spine. Female anus tubular, without
separate urogenital papilla. In females, size and
arrangement of odontodes on plates lateral to anus
similar to adjacent plates, without distinct patch
of differentially arranged odontodes. Female pelvic
spine without flap of soft tissue on posterior surface.