Cylindrostomidae is a family of flatworms belonging to the order Prolecithophora.
Genera: Allostoma van Beneden, 1861 Allostoma Westblad, 1955 Cylindrostoma Örsted, 1845 Einarhelmins Karling, 1993 Enterostomula Reisinger, 1926 Euxinia Graff, 1911 Monoophorum Böhmig, 1890 Pregermarium Stirewalt, Ferguson & Kepner, 1942 Thallagus Marcus, 1951
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