Family Corbulidae

Shell size to 8 mm; shell , trigonal, thick. Sculpture of numerous, fine, poorly-defined concentric threads. Radial, posterior ridge present. Periostracum brown. Color rose or rosy-white.

Shell size reaching 9 mm, shell strongly inequivalve, with pointed posterior region, posterior region often extended by calcified periostracum; radial fold or ridge present, sculpture of irregular commarginal ridges, shell color white to cream-white. Internally often whitish, or with brownish, orangish, or yellowish hues. The shell in the image is a single articulated pair, part of a larger collection of loose valves of the same species found by Susan Hewitt in December 2016 at the Captiva side of Blind Pass.

Shell size reaching 10 mm, shell with pointed posterior region, radial fold or ridge present, sculpture of smooth commarginal ridges, shell color white to light gray. Internally with pinkish or rarely yellowish hues. The shell in the image is a single articulated pair, part of a larger collection of loose valves of the same species found by Ken Piech in December 2021 at Turner Beach, on Captiva.