Facultative or obligate air-breathing ; The species inhabits creeks at elevations near 100 meters, with swift waters lined with rocks and gravel. These water bodies are located within the Pampa biome, in a savanna landscape dominated by herbaceous vegetation. Trees primarily confined to riverbanks with soils composed of clay and gravel .
Dorsal spines (total): 2; Dorsal soft rays (total): 7; Anal soft rays: 4. This species is distinguished by the following set of characters: well developed snout tentacles, pectoral-fin spine long, and exceeding half length of the pelvic-fin leading ray in males; dorsal and caudal fins plain dark brown to black, without lighter spots or bands; dark brown to black background body color; small white to yellow dots on dorsal surface; four branched rays on the anal fin .: elongated; Cross section: flattened.
Behavioural data for Ancistrus Megacanthus is currently being reviewed.
Freshwater; demersal. Tropical South America: Brazil.
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