Clappia umbilicata, the umbilicate pebblesnail, was a species of small freshwater snail that had an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae.

Shell small, globosely depressed, umbilicate, light greenish-yellow, smooth, except for the fine, rather unequal, lines of growth.

Aperture sub-circular, rather longer than broad, obtusely angled above and slightly flattened along the basal margin.

Coosa river at Wetumpka, Ala. (type locality), also at Fort Williams Shoals above Farmer, Ala.

It does not appear to be very abundant at Wetumpka, and only a single example was collected at Fort Williams Shoals.The color of Clappia umbilicata was black.

[1] Clappia umbilicata inhabited only the rapidly flowing sections of river shoals.