Facultative air-breathing in the genus ; Collected at the depth of approximately 30 meters over rocky bottom in areas with slow water flow .
Dorsal spines (total): 2; Dorsal soft rays (total): 7; Anal soft rays: 4. This species is distinguished from all its congeners by having very short dorsal, pectoral and pelvic fins: dorsal-fin spine length approximately equal to the distance from the snout tip to the mid-length of interorbital distance, pectoral-fin spine not reaching to pelvic-fin insertion; and pelvic-fin spine not or just reaching to anal-fin origin (vs. dorsal-fin spine length varying from equal to head length in most species to similar to predorsal length, pectoral-fin spine surpassing insertion of pelvic spine, and pelvic-fin spine surpassing origin of anal fin) . : elongated; Cross section: oval.
Behavioural data for Hypostomus Pastinhai is currently being reviewed.
Freshwater; demersal; depth range ? - 30 m . Tropical South America: Brazil.
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