Oval to quadrangular, longer posteriorly with produced posterior auricle, inflated, left valve slightly larger, solid, white with thick brown periostracum, with 25-27 radial ribs crossed by rounded corn-marginal ridges, no byssal gape; interior white, margin coarsely denticulate, cardinal area wide (see p. 57), hinge line straight, anterior teeth more densely packed. North Carolina to Florida, Bermuda, Bahamas, West Indies, Gulf of Mexico, Caribbean Central America, South America (to Brazil). Length 40 mm (to 92 mm).

Anadara notabilis (Röding, 1798) Distribution: North Carolina, Florida to Texas; Brazil; Bermuda. Size: 38 to 55 mm (1½ to 2½ in). Eared Ark Description: Color uniformly white; shape oblong-rectangular with "ears"; sculpture of narrow, furrowed radial ribs crossed by concentric threads, creating low, beaded appearance; hinge line with numerous comblike teeth; ligamental area long and narrow; umbones large, located about 1/3 of shell length from posterior end. Habitat: In seagrass on sandy or muddy bottoms at depths from 1 to 75 m (3 to 246 ft). Remarks: Rare in Texas. Specimen found in 2003 collected on SPI. Shell depicted in Abbott (1974) is not this species; probably A. floridana. See Odé (1978b); Rehder (1981).

Anadara notabilis (Röding, 1798) Distribution: North Carolina, Florida to Texas; Brazil; Bermuda. Size: 38 to 55 mm (1½ to 2½ in). Eared Ark Description: Color uniformly white; shape oblong-rectangular with "ears"; sculpture of narrow, furrowed radial ribs crossed by concentric threads, creating low, beaded appearance; hinge line with numerous comblike teeth; ligamental area long and narrow; umbones large, located about 1/3 of shell length from posterior end. Habitat: In seagrass on sandy or muddy bottoms at depths from 1 to 75 m (3 to 246 ft). Remarks: Rare in Texas. Specimen found in 2003 collected on SPI. Shell depicted in Abbott (1974) is not this species; probably A. floridana. See Odé (1978b); Rehder (1981).

Anadara notabilis (Röding, 1798) Distribution: North Carolina, Florida to Texas; Brazil; Bermuda. Size: 38 to 55 mm (1½ to 2½ in). Eared Ark Description: Color uniformly white; shape oblong-rectangular with "ears"; sculpture of narrow, furrowed radial ribs crossed by concentric threads, creating low, beaded appearance; hinge line with numerous comblike teeth; ligamental area long and narrow; umbones large, located about 1/3 of shell length from posterior end. Habitat: In seagrass on sandy or muddy bottoms at depths from 1 to 75 m (3 to 246 ft). Remarks: Rare in Texas. Specimen found in 2003 collected on SPI. Shell depicted in Abbott (1974) is not this species; probably A. floridana. See Odé (1978b); Rehder (1981).