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Southwest Florida Shells with Emphasis on Sanibel & Captiva

By José H. Leal

Family Calyptraeidae

Crepidula atrasolea

Colin, 2000

Black-foot Slipper Snail

Shell size to 40 mm; flat or taking the shape of substrate. Septum relatively small, less than half length of shell. Color white inside and out; outside surface sometimes with thin, tan periostracum. Although having a shell virtually indistinguishable from that of Crepidula depressa Say, 1822, C. atrasolea has blackish foot and direct development, whereas C. depressa has a white foot and is a planktotrophic species. The two specimens illustrated on left, part of lot BMSM 15002, are also part of the original material examined by Collin, 2000.