SubFamily: ROTADISCINAE - Genus: Ptychodon C.M.F. Ancey, 1888 (syn: Maoriana, Strobila, Huttonella - DB: 13 SP, 4 IMG)
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SubFamily: ROTADISCINAE - Subgenus: Ptychodon (Alsolemia) F.M. Climo, 1981 (syn: Solemia - DB: 2 SP, 2 IMG)
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SubFamily: ROTADISCINAE - Subgenus: Ptychodon (Pseudohelenoconcha) J. Germain, 1932 (DB: 1 SP, 0 IMG)
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SubFamily: ROTADISCINAE - Genus: Rotadiscus H.A. Pilsbry, 1926 (syn: Unilamellatus - DB: 6 SP, 5 IMG)
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SubFamily: ROTADISCINAE - Genus: Zelandiscus F.M. Climo, 1989 (DB: 2 SP, 2 IMG)
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SubFamily: SEMPERDONINAE - Genus: Himeroconcha G.A. Solem, 1983 (DB: 4 SP, 0 IMG)
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SubFamily: SEMPERDONINAE - Genus: Ladronellum G.A. Solem, 1983 (DB: 1 SP, 0 IMG)
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SubFamily: SEMPERDONINAE - Genus: Semperdon G.A. Solem, 1983 (DB: 5 SP, 0 IMG)
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SubFamily: THYSANOTINAE - Genus: Thysanota J.A. Albers, 1860 (DB: 4 SP, 4 IMG)
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