(Robson, 1929)
(Say, 1834)
(Pilsbry, 1893)
(Deshayes, 1835)
(C.B. Adams, 1842)
(Conrad, 1849)
(Gould, 1850)
(Linnaeus, 1758)
(Say, 1822)
(Linnaeus, 1758)
(Say, 1822)
(Tryon, 1861)
(Deshayes, 1855)
(C.B. Adams, 1852)
(C.B. Adams, 1852)
(Say, 1822)
(H. Adams & A. Adams, 1854)
(G. B. Sowerby II, 1851)
(Dall, 1884)
(Dall, 1895)
(Menke, 1828)
(Lamarck, 1818)
(J.E. Gray, 1838)
(Conrad, 1846)
Family Spondylidae
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Shell size to 65 mm; shell ovoid, scallop-like, with lower valve cemented to hard substrates. Upper valve with background sculpture of irregular radial cords crossed by concentric raised lines. Spines with flat, "duck-feet" extremities present on well-preserved or juvenile upper valves, or juvenile upper valves, but usually worn away in most beached valves. Color brick- to orange-red. Spondylus ictericus is a synonym.
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