[2] The body is generally slender, deepest in the region of the dorsal fin, and the snout is relatively long, about 23-29% of the length of the head.

In B. inpai and B. melanurus, the stripe is longer, advancing onto the dorsal lobe of the caudal fin, and B. allisoni has more predorsal scales than B. chernoffi (10-12 vs. 8–9, respectively).

[7] The specific name "allisoni" is in honor of Venezuelan ichthyologist Antonio Machado-Allison, who has written or co-authored a large amount of literature concerning the taxonomy of Bryconops.

Based on patterns seen in other members of the genus, it may be under threat of various anthropogenic hazards, including illegal mining and farmland settlement.

[8] The Tapajós main has been subject to such intense mining activity in the past that portions of it have turned entirely brown due to sediment addition and disturbance.

[citation needed] However, its type locality, the Corredor Ecológico stream, is a tributary of the Tapaós located in the Tapajos National Forest, a large area of protected land.