Orientogalba Kruglov & Starobogatov, 1985

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 Orientogalba Kruglov & Starobogatov, 1985

Kruglov & Starobogatov, 1985b: 28.

Type species: Lymnaea heptapotamica Lazareva, 1967 (by original designation).

Diagnosis: Shell typically small (≤ 12 mm in height, rarely larger), ovoid, ovate-conical or high-conical. Whorls are visibly inflated, with aperture relatively enlarged. Prostate with a single internal fold. Praeputium sac-like; it is much wider and slightly longer than the penis sheath. The penial knot is absent.

Species richness: The genus includes several nominal species, only some of which have been studied genetically ( Vinarski et al. 2020). The East Asian Region is inhabited by the widespread Orientogalba ollula ( Gould, 1859) (for the account for this species, see Vinarski et al. 2020) ( Figs 4H , 5H ) and the Japanese endemic O. hokkaidoensis ( Figs 6G–I , 7C )

Distribution: East, Southeast, and Central Asia; Pacific Region. Introduced to some areas remote from the native range.

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).

Figure 6. Shells of the three lymnaeid species described here as new to science.A, Galba pacifica, the holotype. B, G. pacifica, a paratype (ZIN no.4/531-2021, a ditch near the Horokatomamu Stream). C, G. pacifica, a paratype (RMBH, no.MLym-1113/4, Naie Stream). D, Kamtschaticana nipponica, the holotype.E, K. nipponica, a paratype (RMBH, no. MLym-1115/3). F, K. nipponica, a paratype (RMBH, no. MLym-1115/1). G, Orientogalba hokkaidoensis, the holotype. H, O. hokkaidoensis, a paratype (Hikirichi Stream).I, O. hokkaidoensis, a paratype (RMBH, no. MLym-1114/2). Scale bars:5 mm. Photographs:Maxim V.Vinarski (A, B, D, G, H) and Olga V.Aksenova (C, E, F, I).

Figure 7. Copulatory apparatuses of the three lymnaeid species described here as new to science. A, Galba pacifica, a paratype (RMBH, no.MLym-1113/4, Naie Stream), soft body and the copulatory apparatus. B, Kamtschaticana nipponica, a paratype (RMBH, no. MLym- 1115/1), soft body. C, Orientogalba hokkaidoensis, a paratype (RMBH, no. MLym-1114/2), soft body, female part of the reproductive system and the copulatory apparatus. Scale bars:1 mm (copulatory apparatuses and female reproductive system) and 5 mm (soft bodies). Photographs: Olga V. Aksenova.