The Depressed Top Snail, Calliostoma yucatecanum Dall, 1881 is a medium-sized (about 0.5 inch) species. Among the five local species of the family Calliostomatidae, the Depressed Top Snail is the one with the more depressed (wider in relation to the shell height, with a low spire) shell. The shell typically displays a sculpture of spiral cordlets, about 10–12 spiral on last whorl, 3–4 on periphery (the outer shell “rim”), 10 on base. The color is light brownish- or yellowish-cream, with large streaks of darker color.
The Depressed Top Snail, Calliostoma yucatecanum, from Blind Pass, Sanibel Island. Photo by José H. Leal.