Knaacks cory (Hoplisoma knaacki), first described by Tencatt & Evers, 2016 is a tiny fish. Adults typically reach 4.00 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus.
Dorsal spines (total): 2; Dorsal soft rays (total): 7 - 8; Anal soft rays: 7 - 9. Corydoras knaacki is distinguished from its congeners by having the following combination of characters: a longitudinal black stripe along midline of flank; short mesethmoid, with anterior portion smaller than 50% of the bone length; serrations on posterior margin of pectoral spine directed towards the tip of the spine; dorsal fin with the region of the first branched ray, including membrane, with black pigmentation, the remaining areas with irregular black blotches; lacking a vertically elongated black blotch across the eyes; snout with conspicuously rounded moderately-developed black spots; and ventral expansion of infraorbital 1 moderately developed .: fusiform / normal.
Behavioural data for Knaacks cory is currently being reviewed.
Freshwater; demersal. Tropical South America: Río Madre de Dios basin, Peru.
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