Family Lucinidae

Shell size to 41 mm; shell circular, compressed, with squarish, truncated posterior end. Sculpture smooth, except for coarse growth lines. Hinge with small teeth, expanded posterior hinge platform. Periostracum thin, brownish. Color white.

Shell size to 10 mm; shell small but thick. Sculpture of 8-9 round, wide radial ribs superimposed by numerous concentric threads. Umbones touching. Lunule small. Internal margin of valves crenulated. Color white. Found in protected bay areas.

Shell size to 60 mm; shell circular, compressed, with squarish, truncated posterior end. Sculpture smooth, except for coarse, irregular ridges. Hinge with small teeth, expanded posterior hinge platform. Lateral teeth strong. Lunule well-defined, raised. Periostracum thin, brownish. Color white or white suffused with peach-orange.

Shell size to 110 mm; Similar to Anodontia alba, but larger. Finer concentric growth lines. Differs from alba by angled position of anterior muscle scar in relation to pallial line. Surface inside of shell pebbly and rough to touch. Color chalky-white externally and internally. Anodontia philippiana (Reeve, 1850) is a synonym.

Shell size to 6 mm; shell circular to oblique-oval, sculpture with variable "mesh" of commarginal and radial lines. Usually white, sometimes with cream to yellowish tinges. Formerly known as "Lucina multilineata" or "Parvilucina multilineata" (Tuomey and Holmes, 1857). Not commonly found, possibly because of small species size.

Shell size to 14 mm; shell small, circular. Sculpture of radial and concentric forming sharp reticulated pattern. Shell margins finely crenulated. Lunula large, well defined. Color pure white.

Shell size to 50 mm; Shell circular, with marked, irregularly distributed commarginal ("concentric") growth lines, and strong posterior groove. Shell whitish, sometimes with hints of light brown imparted by delicate periostracum. Periostracum consisting of fine extensions each ending in a calcified (hard) "scale". Well-preserved periostraca are, however, difficult to observe, as beach-collected valves are usually eroded. The main illustration shows a complete shell found by Ken Piech in June 2019 at Kice Island, in Collier County. The next illustration shows a worn valve found on Sanibel (where the species is unusually rare) by Susan Hewitt, in December 2014. The additional illustration, of a shell from the Bahamas, collected by Colin Redfern, serves to show the unusual periostracum, characteristic of the species.

Shell size to 25 mm; small lucinid characterized by a sculpture of singular cross-hatched (criss-crossed), lines. Shell circular, moderately inflated, glossy white. R. Tucker Abbott indicated, in the 1974 edtion of "American Seashells," that this species "is used extensively in the shellcraft business." The shell in this photo was found by Gail Carr (from Silver Spring, MD) on the Captiva side of Blind Pass on January 23, 2014. That area just underwest extensive beach renourishment in the latter part of 2013.

Shell size to 20 mm; shell resembles small, more inflated Codakia orbicularis. Sculpture of coarser radiating lines crossed by concentric threads. Lunule elongate, large. Color pure white, light orange, or yellow. Never pink internally.

Shell size to 85 mm; shell circular, compressed. Sculpture of radial lines crossed by finer concentric threads. Lunule deep, heart-shaped, larger on right valve. Periostracum thin, brownish. Color white, margins often pink internally. This is a common species in the tropical Western Atlantic, including the East Coast of Florida and the Florida Keys. Although there is a good record from Kice Island (collected by Amy Tripp in 2011), the few records of the species for Sanibel present in the Museum collection are most likely cases of mislabeled locality data.