Genus Megathura H. A. Pilsbry, 1890

(5-4-1-2-1-1-3-9-0-0-0-0-0)
Ref. Abbott & Dance, 1982 p 26
[see also under Subfamily DIODORINAE]

crenulata (G. B. Sowerby, 1825)
(5-4-1-2-1-1-3-9-0-1-0-0-0)
Giant Keyhole Limpet, Great Keyhole Limpet
Ref. Abbott & Dance, 1982 p 26 c
Amer. Fish. Soc., 1988 p 53