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Southwest Florida Shells with Emphasis on Sanibel & Captiva

By José H. Leal

Family Vitrinellidae

Teinostoma incertum

Pilsbry & McGinty, 1945

Uncertain Vitrinella

This is a very small species, even for the small-sized family Tornidae. It reaches only about 2 mm (0.8 inch) in diameter. The shell is smooth, totaling only about 3.5 whorls, with an open umbilicus, and the callus is almost completely absent. The shell is compressed, with the apex projecting only slightly, the whorl profile rounded, and the aperture oblique. There strong axial lines reaching adapically inside the umbilicus. The shell color in the Uncertain Vitrinella is translucent-white. The shell illustrated was collected in 2002 by Lois Dunnam at Gulf Side City Park on Sanibel. Photos by James F. Kelly.