Anadara baughmani: Elongated oval, skewed anterodorsally, left valve slightly larger, longer posteriorly, solid, white with brown periostracum, with 28-30 flat radial ribs, smooth or beaded commarginally, anteriormost ribs faintly or not cut medially, interrib spaces with close commarginals, no byssal gape; interior white, margin coarsely denticulate, cardinal area wide, hinge line straight. Florida Keys, Gulf of Mexico, Caribbean Central America, South America (to Uruguay). Length 45 mm. Syn. springeri Rehder & Abbott, 1951. Compare Anadara floridana, which has more radial ribs that are strongly radially grooved. Note: The valves photographed are of the HOLOTYPE specimen of Anadara springeri Rehder & Abbott, 1951, a synonym of A. baughmani.

Anadara baughmani Hertlein, 1951 Distribution: Texas, Gulf of Mexico; Brazil. Size: 38 to 54 mm (1 1/2 to 2 ½ in). Baughman's Ark Description: Color uniformly white; shell thick, ovate, and inflated; sculpture of thick, radial, modular ribs and commarginal growth lines, giving a some- what scaly appearance; numerous small concentric riblets between radial ribs; hinge plate long with vertical comblike teeth that become smaller toward the center; ligamental area wide and short. Habitat: Muddy bottoms. Infaunal. On Texas coast at depths from 0 to 183 m (600 ft). Remarks: Common name listed as "Baughman's ark." Turgeon et al. (1998) suggest "skewed ark" to describe anterior margin. See Pulley (1952a); Odé (1978b).