Classification of the subgenus Undularia (Protorcula)
G. †Protorcula Kittl 1894
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†Protorcula bassetti Smith 1927
†Protorcula bosniaca Kittl 1903
†Protorcula frydai Nützel et al. 2003
†Protorcula iranica Nützel et al. 2012
†Protorcula larica Kittl 1899
†Protorcula loxonemoides Kittl 1894
†Protorcula matthioli Stoppani 1858
†Protorcula obliquelineata Kittl 1894
†Protorcula parvula Krumbeck 1913
†Protorcula permiana Nützel and Nakazawa 2012
†Protorcula pusilla Stoppani 1858
†Protorcula quadricostata Gründel 2007
†Protorcula subpunctata Münster 1841
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Invalid names: Terebratula bucklandii Klipstein 1843 [synonym], Turritella gaytani Klipstein 1843 [synonym], Turritella hehlii Klipstein 1843 [synonym], Turritella marginenodosa Münster 1841 [synonym], Turritella nodulosa Braun 1841 [synonym]
†Protorcula unicarinata Kittl 1899
†Protorcula wichmanni Krumbeck 1924
†Undularia (Protorcula) densepunctata Kittl 1894
†Undularia (Protorcula) excavata Laube 1868