Subgenus (Fissurellidea) A. Orbigny, 1841
(5-4-1-2-1-1-4-10-1-0-0-0-0)

bimaculata W. H. Dall, 1871
(5-4-1-2-1-1-4-10-1-1-0-0-0)
Two-spot Keyhole Limpet
Ref. Amer. Fish. Soc., 1988 p 53
Kaicher, 1988 #5447 bw

megatrema A. Orbigny
(5-4-1-2-1-1-4-10-1-2-0-0-0)
Ref. Kaicher, 1988 #5468 bw