The penial stalk of the Zonitoides nitidus (O. F. Müller, 1774) spermathecal duct is found to be an additional allosperm container. Inside the penial stalk of spermathecal duct, sperm was observed in hemiphallic snails only. At the same time, some specimens had sperm inside the penis. The atrial stalk of spermathecal duct is the distal part of spermathecal duct.
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Jordaens K., Vanriel P., Backeljau T. 2003. Molecular and morphological discrimination between the pulmonate landsnails Zonitoides nitidus and Zonitoides excavatus. J. Moll. Stud. 69: 295-300. https://doi.org/10.1093/mollus....
Shileyko A. A. 1972. Analiz osnovnykh chert organizatsiyi Zonitoides nitidus v svyazi s voprosom o sistematicheskom range Gastrodontinae (Gastropoda, Pulmonata, Stylommatophora). Proc. Zool. Mus. Moscow State Univ. 12: 145-155.
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