The Smooth Risso
The Smooth Risso, Zebina browniana (d'Orbigny, 1842), is one the many micromollusks found on Sanibel and Captiva, but the only one from the gastropod family Zebinidae found locally. Reaching not more than 0.2 inch in size, it qualifies as a true micromollusk, as, by definition, micromollusks are those having shells not larger than 5 mm, or about 0.2 inch. The shell shape is conical and, as the common, or vernacular, name implies, smooth and devoid of any sculpture, smooth. Th