Classification of the genus Ptychostoma
G. †Ptychostoma
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†Ptychostoma mojsisovicsi Kittl 1892
†Ptychostoma pleurotomoides Wissmann 1841
†Ptychostoma stachei Kittl 1892
†Ptychostoma waehneri Kittl 1892
Invalid names: Kittlia Cossmann 1909 [objective synonym]