Family Fissurellidae

Shell size to 10 mm; shell with a relatively large "keyhole" centered on shell. Shell ends slightly turned up. Shells side slightly concave. Sculpture of about 20-25 scaly radial ribs and concentric threads. Color whitish with red-brownish maculations. Locally rare. Only four shells are present in the Museum's Sanibel collection. The main shell (three views) was found by Susan J. Hewitt on Turner Beach, Captiva, December 2015.

Shell size to 18 Shell with a sculpture of alternating primary and secondary ribs and concentric cords. Shell edge scalloped, shell oval, and orifice ("keyhole") also oval and reinforced internally by a callus. This later is in turn delimited by a reddish-pink line. Shell colors and patterns vary, but mostly consist of reddish-brown radial bands of distinctive widths set on a lighter-colored background. The internal shell surface is greenish. The limpet illustrated was found by Austin Salender on Sanibel. The only other record of the species from our area in the Museum collection consists of two shells collected in 1957 by William Brumbach on Sanibel!

Shell size to 12 mm; shell small, oval in outline, orifice ("keyhole") rounded-oval, situated anterior to shell center. Sculpture of 35-40 radial ribs, with a single thinner riblet present between each pair. Concentric threads on entire shell surface cross ribs giving beaded aspect to each intersection. Callus on internal surface of orifice of constant width. Shell whitish to light-cream colored. The illustrated shells are so far the only records of the species for Sanibel or Captiva islands. Shells illustrated were all collected by Susan J. Hewitt on the Blind Pass side of Captiva (Turner Beach), respectively in December 2015, December 2014, and December 2017.

Shell size to 30 mm; shell elevated, elliptical. Keyhole elongate. Sculpture of numerous radial riblets of which every third or fourth is larger. Color buff, white, or dark-gray. Like most representatives of the keyhole limpet family Fissurellidae, this species shows the typical keyhole-shaped orifice that serves to reroute waste water away from the head of the animal. The shell has a sculpture of numerous radial riblets of which every third or fourth is larger. The animal feeds on microalgae growing on rocks or other hard substrates.The picture of the live specimen was taken by Amy Tripp near Marco Island.