[4] Atlanta brunnea is a small species (shell diameter to 2.0 mm) that is darkly pigmented (brown to reddish-and golden-brown).

[5] The keel is tall and colorless, and inserts between the last and penultimate shell whorls in animals larger than 1.5 mm.

[1] The whole surface of the protoconch is furthermore covered with numerous finer spirals in an irregular zigzag shape, also on the base and within the umbilicus.

[1] From that point on the whorl diameter increases rapidly, by which the shape of the shell becomes lenticular.

[5] Description overview: Atlanta brunnea has an almost worldwide tropical and subtropical distribution pattern.