Family Pyramidellidae

Shell size to 3 mm; shell ovate-conical. Whorls with strongly angled shoulders. Last whorl comprising about ¾ of shell length. Base not set apart from last whorl. Sculpture of axial riblets and spiral threads that produce net-like pattern covering entire shell surface. Color translucent-white. Not common but found on Sanibel.

Shell size to 5 mm; shell small, elongate-conical. Sculpture of 4-6 spiral cords with squarish nodules. Suture channeled. Base with 3-4 spiral incised lines. Columella with single fold. Aperture flared anteriorly. Color translucent white. The species is an ectoparasite of other mollusks, in particular the Common Slipper Snail, Crepidula fornicata, and the Atlantic Bay Scallop, Argopecten irradians.

Shell size to 6 mm; Shell small, elongate-conical. Sculpture of four raised spiral cords separated by deep grooves. Fine axial lines present between cords. Columella with single strong fold. Color white. The species is an ectoparasite on the Eastern Oyster, Crassostrea virginica.