Classification of the genus Trigonotreta
G. †Trigonotreta Koenig 1825
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†Spirifer (Trigonotreta) strigosus Meek 1860
†Trigonotreta australis Bion 1928
†Trigonotreta cracovensis Wass 1966
†Trigonotreta guizhouensis Liao 1979
†Trigonotreta hobartensis Brown 1953
†Trigonotreta larghii Angiolini et al. 2005
†Trigonotreta lightjacki Archbold and Thomas 1986
†Trigonotreta lyonsensis Archbold and Thomas 1986
†Trigonotreta orientensis Archbold and Singh 1993
†Trigonotreta sanjuanensis Lech and Aceñolaza 1990
†Trigonotreta semicircularis Shen et al. 2000
†Trigonotreta stokesi Koenig 1825
†Trigonotreta stokesii Koenig 1825
†Trigonotreta victoriae Archbold 1991
Invalid names: Grantonia Brown 1953 [synonym]