Imparfinis Arceae (Imparfinis arceae) is a ray-finned fish of the family Heptapteridae. It inhabits freshwater waters in benthic environments. This species can reach a maximum total length of 6.7 cm. With a trophic level of 3.1, it is a low-level carnivore, feeding on invertebrates and small organisms.
Dorsal soft rays (total): 6; Anal soft rays: 7; Vertebrae: 39. This species is distinguished by the following set of characters: wide, dark midlateral stripe from snout tip to caudal peduncle sharply contrasting pale underside and aligned with dark stripe centered on dorsal portion of lower caudal-fin lobe; 11-12 gill rakers on the first ceratobranchial; dark brown W-shaped band at the base of caudal peduncle absent; 39 vertebrae; maxillary barbel surpassing vertical through dorsal-fin origin; short, flexible extension of the pectoral- and dorsal-fin spines, and outermost primary rays of upper caudal-fin lobe absent .: elongated; Cross section: oval.
Behavioural data for Imparfinis Arceae is currently being reviewed.
Freshwater; demersal. Tropical South America: Brazil.
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