Turbellarian taxonomic database

Abstract / Notes

A synopsis of actually valid considered species of the subfamily Mesostominae is proposed. The presentation is
based on the revision of original descriptions, of serial sections (holotypes), and on the preparation of
serial sections of new material. In addition to diagnostic features commonly used within the subfamily, a
high value of species classification is set on the following organization features, too: Entrance of vasa
deferentia and granular glands in the male organ separate or common, cuticularization of the ductus
ejaculatorius exterior, and position of the female canal to the male system. Result of this comparative study
is the establishment of three genera within the Mesostominae: Mesostoma Oersted. 1844, Bothromesostoma Braun,
1885, and Marcomesostoma gen. n. The genera Mesostoma and Bothromesostoma include 34 valid species. Based on
the presence of a ductus communis inferior and superior, a true prostatic vesicle, and cuticularly lined
spines in the atrium, cirrus, and ductus superior Mesostoma evelinae Marcus, 1955 is transferred to the genus
Marcomesostoma gen. n., Marcomesostoma evelinae (Marcus, 1955) comb. nov.

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