This species is found exclusively in stone bottom habitats, covered with all sizes of stones and rocks along the rio Quaraí and its tributaries .
Dorsal spines (total): 12 - 15; Dorsal soft rays (total): 9 - 11; Anal spines: 3; Anal soft rays: 7 - 9. This species is distinguished from its congeners, except G. labiatus, by having a thick, extremely well developed lips, with the lower lip deeply notched medially; differs from labiatus by the presence of a dark band extending posteroventrally from the dorsal-fin origin (vs. absent), and by the dorsal, anal and caudal-fin color patterns, where fins are partially or completely covered with well-defined circular dots (vs. small longitudinal stripes) .Cross section: compressed.
Behavioural data for Gymnogeophagus Pseudolabiatus is currently being reviewed.
Diet information for Gymnogeophagus Pseudolabiatus is currently being compiled.
Reproduction data for Gymnogeophagus Pseudolabiatus is currently being compiled.
Freshwater; benthopelagic. Tropical South America: Brazil and Uruguay.
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