Subgenus (Trapezium) Megerle v Muhlfeld, 1811

(3-4-4-0-1-13-0-22-3-0-0-0-0)
Ref. Bernard, 1983 p 49

angulatum J. B. P. A. de Lamarck
(3-4-4-0-1-13-0-22-3-1-0-0-0)
[=Trapezium (Trapezium) bicarinatum (C. F. Schumacher, 1817)]
Ref. Abbott & Dance, 1982 p 351

bicarinatum (C. F. Schumacher, 1817)
(3-4-4-0-1-13-0-22-3-2-0-0-0)
Carinate Trapezium Clam
Syn. Trapezium (Trapezium) angulatum J. B. P. A. de Lamarck
Ref. Abbott & Dance, 1982 p 351 c

californicum [californica] (T. A. Conrad, 1837)
(3-4-4-0-1-13-0-22-3-3-0-0-0)
Syn. Cypricardia californica T. A. Conrad, 1837
Ref. Bernard, 1983 p 49

delicatum H. A. Pilsbry, 1905
(3-4-4-0-1-13-0-22-3-4-0-0-0)
[=Trapezium (Neotrapezium) liratum (L. A. Reeve, 1843)]
Ref. Abbott, 1974 p 518

halioticola W. H. Dall, 1871
(3-4-4-0-1-13-0-22-3-5-0-0-0)
[=Milneria minima (W. H. Dall, 1871)]
Ref. Bernard, 1983 p 35
[see under Superfamily: CARDITACEA]

japonicum H. A. Pilsbry, 1905
(3-4-4-0-1-13-0-22-3-6-0-0-0)
[=Trapezium (Neotrapezium) liratum (L. A. Reeve, 1843)]
Ref. Abbott, 1974 p 518
[=Trapezium (Trapezium) liratum (L. A. Reeve, 1843)]
Ref. Bernard, 1983 p 49

liratum [lirata] (L. A. Reeve, 1843)
(3-4-4-0-1-13-0-22-3-7-0-0-0)
Syn. Cypricardia lirata L. A. Reeve, 1843;
Trapezium (Trapezium) japonicum H. A. Pilsbry, 1905;
Trapezium (Trapezium) nipponicum M. Yokoyama, 1922;
Trapezium (Trapezium) ventricosum M. Yokoyama, 1922
Ref. Bernard, 1983 p 49

nipponicum M. Yokoyama, 1922
(3-4-4-0-1-13-0-22-3-8-0-0-0)
[=Trapezium (Trapezium) liratum (L. A. Reeve, 1843)]
Ref. Bernard, 1983 p 49

oblonga [oblongum] (C. v. Linne, 1758) [T]
(3-4-4-0-1-13-0-22-3-9-0-0-0)
Oblong Trapezium Clam
Ref. Abbott & Dance, 1982 p 351 c
Syn. Chama oblonga C. v. Linne, 1758
Ref. Abbott, 1974 p 518

ventricosum M. Yokoyama, 1922
(3-4-4-0-1-13-0-22-3-10-0-0-0)
[=Trapezium (Trapezium) liratum (L. A. Reeve, 1843)]
Ref. Bernard, 1983 p 49