Subgenus (Montfortia) C. A. Recluz, 1843

(5-4-1-2-1-1-2-12-2-0-0-0-0)
Ref. Abbott, 1974 p 21
Keen, 1971 p 312
Lindner, 1977 p 33
Vaught, 1989 p 6

australis J. R. C. Quoy & J. R. Gaimard, 1832 [T]
(5-4-1-2-1-1-2-12-2-1-0-0-0)
Ref. Abbott, 1974 p 21

emarginata (H. M. D. de Blainville, 1825)
(5-4-1-2-1-1-2-12-2-2-0-0-0)
Emarginate Emarginula
Ref. Amer. Fish. Soc., 1988 p 53
Syn. Hemitoma (Hemitoma) ostheimerae (R. T. Abbott, 1958);
Hemitoma (Hemitoma) retiporosa (W. H. Dall, 1903)
Ref. Abbott, 1974 p 21 bw

Form ostheimerae R. T. Abbott, 1958
(5-4-1-2-1-1-2-12-2-2-0-1-0)
Ref. Abbott & Dance, 1982 p 24 c

hermosa H. N. Lowe, 1935
(5-4-1-2-1-1-2-12-2-3-0-0-0)
Ref. Keen, 1971 p 312 bw