Kamtschaticana Kruglov & Starobogatov, 1984

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 : 16

Genus Kamtschaticana Kruglov & Starobogatov, 1984

Kruglov & Starobogatov, 1984: 30.

Type species: Lymneus kamtschaticus Middendorff, 1850 (by original designation).

Diagnosis: Shell typically small (≤ 12 mm in height, rarely larger), spheroid to ovate-conical, with low spire and conspicuously inflated body whorl. Whorls are visibly convex and rounded. Prostate with a single internal fold. Praeputium dark-pigmented, sac-like; it is much wider than the penis sheath. The ratio of the lengths of these structures slightly exceeds 1.0 (i.e. praeputium is slightly longer than penis sheath). The penial knot is absent. The spermathecal duct is short.

Species richness: In addition to the type species, we describe another species herein, K. nipponica . We found another candidate species in Lake Azabachye in Kamchatka. However, this is known from only a single sequenced specimen, and we refrain from its description but refer to it as Kamtschaticana sp.1 ( Fig. 5M ). Vinarski et al. (2021) provided additional detail on the taxonomy and species composition of Kamtschaticana .

Distribution: The type species, K. kamtschaticana ( Figs 4G , 5K, L ), is widely distributed in northeast Asia and in the Russian Far East and the southern parts of Eastern Siberia. The findings of this species from Alaska are also known ( Vinarski et al. 2021). With the description of K. nipponica , the range of the genus extends to Japan (Hokkaido Island), although there are no records of Kamtschaticana from the Kurile Islands.

Figures

Figure 4. The copulatory apparatuses of the pond snails discussed in the taxonomic account. A, Dallirhytis atkaensis (Russia, the Chukchi Peninsula, Lake Vaaliuchio). B, Galba sibirica (Mongolia, the Teellin-gol River; after Vinarski et al. 2017b). C, Galba truncatula (Abkhazia, Gagra District, wet shore of Inkit Lake; after Vinarski et al.2017b). D, Ladislavella liogyra (Russia, Primorye, a pool near Lake Lebedinoye).E, Walhiana catascopium (Russia, Kamchatka, Azabachye Lake; RMBH). F, Lymnaea sorensis (Russia, Kamchatka, Kamchatka River; RMBH). G, Kamtschaticana kamtschatica (Russia, Magadan Region, a water reservoir; after Vinarski et al. 2021). H, Orientogalba ollula (Russia, Primorye Territory, near Possiet Settlement; after Kruglov 2005). I, Radix auricularia (Russia, Tyumen’ Region, Vylposl channel near Labytnangi Town). J, Radix plicatula (China, Bejing, an artificial pond in the former Emperor’s summer palace; after Vinarski et al. 2020). K, Radix cf.hamadai (Japan, Matsumae; after Vinarski et al. 2020). Scale bars: 1 mm.Photographs: Maxim V. Vinarski (A–D, G, I–K) and Olga V. Aksenova (E, F).

Figure 5. Shells of the Amphipepleinae species. A, Radix auricularia (Russia, Khabarovsk City, a pond in the city park; LMBI). B, Radix coreana syn. nov., a syntype (ZMB; after Vinarski 2016). C, Radix cf.hamadai (Japan, Hokkaido, Matsumae; LMBI). D, Radix japonica (Japan, Yeddo; SMF).E, R. japonica (Japan, Yokohama; SMF). F, R. japonica (original drawing after Jay 1857). G, Radix onychia (Japan, Lake Biwa, southern shore near Otsu; ZIN). H, Orientogalba ollula (Russia, Primorye Territory, near Possiet Settlement; ZIN). I, Radix plicatula [Taiwan (= ‘Formosa’); MNHN]. J, Radix plicatula [East China (‘Manchouria, Port-Artur’); MNHN]. K, Kamtschaticana kamtschatica, the lectotype (ZIN). L, K. kamtschatica (Russia, Kamchatka, the Valley of Geysers).M, Kamtschaticana sp.1 (Russia, Kamchatka Peninsula, Lake Azabachye). Scale bars: 1 mm in K; 2 mm in G, H, L, M; 5 mm in A–E, I, J; not given in the original drawing in F. Photographs:Maxim V. Vinarski (A–E, G–J), Tatiana Ya.Sitnikova (K), and Olga V. Aksenova (L, M).