A specimen of Mastus cf. cretensis from the island of Crete, Greece, appears to have a separate duplicate penis; a scrutiny of the reproductive system of this animal shows that this abnormality doubtlessly precludes reproduction.

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Nederlandse Malacologische Vereniging

Wim J.M. Maassen. (2000). A separate duplicate penis in a specimen of Mastus (Gastropoda, Pulmonata, Buliminidae) from Greece. Basteria, 64(1/3), 33–34.