Bostrycapulus aculeatus (Gmelin, 1791) Spiny Slippersnail
Distribution: North Carolina to Florida, Texas; Brazil; Bermuda. Size: 12 to 25 mm Description: Color white with brown maculations or rays, sometimes tan throughout; shell cap shaped; sculpture rough with rows of irregular, nodular ribs with spines toward the periphery; muscle scar impressed, lunar shaped, found at right interior section of inner portion of shell; beak or apex small, adpressed, not excavated; deck extended almost to middle portion of aperture and divided by carina; aperture long and ovate to subquadrate.
Habitat: Found on shelly bottoms at depths from 0 to 80 m (262 ft). Remarks: B. aculeatus is more coiled than other crepidulid species. No planktonic development. Least common crepidulid in Texas. See Ode and Speers (1969d); Hoagland (1977); Ode (1983a); Collin (2003). Synonym: Crepidula aculeata (Gmelin, 1791).