Teinostoma semistriatum (d'Orbigny, 1842)

    Isabela, Puerto Rico (1.2 mm). Digital images by David Kirsh. The multispiral operculum is characteristic of the genus and its subfamily (Teinostomatinae) as well as the Circulinae and Vitrinellinae; the other western Atlantic subfamily, Torninae, has a paucispiral operculum (Rubio et al., 2011: 14, passim).

    From grunge collected from a mangrove beach on the Jupiter Sound (Indian River) shore of Coral Cove Park (just S of Blowing Rock Preserve) by Rick Edwards in April and July, 2021 and later culled by him and H. G. Lee (1.93 mm.). SEMs performed by H. G. Lee in collaboration with Dr. Ann Heatherington, Dept. of Geological Sciences, University of Florida, Gainesville, FL.

From Florida Pliocene - about three million years before present.