Family Tornatinidae

Shell to 4 mm, ovate-cylindrical. This small snail reaches 4 mm (0.16 inch), has a characteristic sunken spire, and the columella (viewed on the left side of the aperture, or opening) with two folds that at a glance look like two "teeth." The aperture is flared in anterior direction (on bottom of the pictures). Color white.

Shell size to 5 mm; shell small, cylindrical. Spire usually around 1/5 shell length or slightly more. Sculpture of very fine growth lines. Shoulder keeled in juvenile specimens, round in adults. Protoconch partially sunken. Aperture long, narrow, outer lip flaring anteriorly. Subsutural band moderately to strongly etched. Columella with single fold. Color porcellaneous-white. Foot and mantle translucent-white, with irregular opaque-white spots. No black pigmentation present. Cephalic shield and propodium present. Prefers open water but may be found in protected, bay areas. The shell in the main photo was tentatively identified by Paula Mikkelsen. Photos of live snail (Sarasota Bay) by Ángel Valdés.

Shell size to 5 mm; shell small, slightly pear-shaped. Spire usually less than 1/5 of shell length. Sculpture of very fine growth lines. Shoulder keeled in juvenile specimens, round in adults. Protoconch partially sunken. Aperture long, narrow, outer lip flaring anteriorly. Subsutural band moderately etched. Columella with single fold. Color porcellaneous-white. Foot and mantle translucent-white, with irregular opaque-white spots. No black pigmentation present. Cephalic shield and propodium present. Very similar to Acteocina candei, but A. canaliculata tends to have taller spire, more incised subsutural band, and it lives in more open-water locations. The shell in the main photo was tentatively identified by Paula Mikkelsen.