Subgenus (Trigonella) T. A. Conrad, 1837

(3-4-4-0-26-7-9-7-4-0-0-0-0)
[see also as Genus]

crassatelliodes T. A. Conrad, 1837
(3-4-4-0-26-7-9-7-4-1-0-0-0)
[=Tivela (Pachydesma) stultorum (J. Mawe, 1823)]
Ref. Bernard, 1983 p 53

solidissima R. A. Philippi, 1851
(3-4-4-0-26-7-9-7-4-2-0-0-0)
[=Tivela (Pachydesma) stultorum (J. Mawe, 1823)]
Ref. Bernard, 1983 p 53