Ladislavella B. Dybowski, 1912

Aksenova, Olga V., Vinarski, Maxim V., Itagaki, Tadashi, Ohari, Yuma, Oshida, Tatsuo, Kim, Sang Ki, Lee, Jin Hee, Kondakov, Alexander V., Khrebtova, Irina S., Soboleva, Alena A., Travina, Oksana V., Sokolova, Svetlana E., Palatov, Dmitry M., Bespalaya, Yulia V., Vikhrev, Ilya V., Gofarov, Mikhail Yu. & Bolotov, Ivan N., 2024, Taxonomy and trans-Beringian biogeography of the pond snails (Gastropoda: Lymnaeidae) of East Asia: an integrative view, Zoological Journal of the Linnean Society 201 (4), pp. 1-24 : 12

Genus Ladislavella B. Dybowski, 1912 s.s.

Dybowski 1912: 179.

Type species: Ladislavella sorensis B. Dybowski, 1912 = Limnaea palustris var. terebra Westerlund, 1885 (by subsequent designation).

Diagnosis: Shell of typical ‘stagnicoline’ shape, tall and slender, with high spire and weakly inflated body whorl. Its size is typically not larger than 22 mm. Shell shape varies from high-turriculate to high-conical. Prostate with a single fold inside. The penial knot is absent. Praeputium is dark-pigmented, slender and relatively narrow; its width slightly exceeds the width of the penis sheath ( Fig. 4D). The lengths of the praeputium and penis sheath are almost equal; the distal part of the latter is somewhat swollen.

Species richness: Four or five species, one of them, Ladislavella liogyra ( Westerlund, 1897) , occurs within the studied region. It is characterized by a very slender turriculate shell ( Fig. 3E); the number of whorls can reach 7.5–8.0. There are no similar species in East Asia.

Distribution: The genus is distributed from Central and East Europe eastwards to the southern part of the Russian Far East (the middle and lower courses of the Amur River, Primorye, and Sakhalin Island).