"Shell small, very oblique. Anterior auricle small, defined by a shallow depression producing an inflexion in the growth lines and a sinus in the anterior outline. The body of the shell is much prolonged and is strongly convex transversely. It is abruptly and deeply depressed on the upper side of the umbonal ridge to the level of the posterior wing, which is flattened, produced, mucronate, and with a deep emargination below.
The surface is marked by fine, strong, and somewhat irregular concentric lamellae." [Girty, 1908: 426.]
"This species most nearly resembles Avicula longa Geinitz (...)" [Girty, 1908: 427.]
"Top of Capitan formation, Capitan Peak (station 2966); middle of Capitan formation, Capitan Peak (station 2926), Guadalupe Mountains, Texas." [Girty, 1908: 427.]
Girty, 1908:Pl. 9, fig. 20, 20a.
"This species is based on a left valve (...)" [Girty, 1908: 426.]