Taxonomic assessment of genetically-delineated species of radicine snails (Mollusca, Gastropoda, Lymnaeidae) Author Vinarski, Maxim V. Laboratory of Macroecology and Biogeography of Invertebrates, Saint-Petersburg State University, 7 / 9 Universitetskaya Emb., 199034, Saint-Petersburg, Russia & Omsk State University, 28 Adrianova Str., 644077, Omsk, Russia https://orcid.org/0000-0002-7644-4164 radix.vinarski@gmail.com Author Aksenova, Olga V. Laboratory of Macroecology and Biogeography of Invertebrates, Saint-Petersburg State University, 7 / 9 Universitetskaya Emb., 199034, Saint-Petersburg, Russia & N. Laverov Federal Center for Integrated Arctic Research, Ural Branch of the Russian Academy of Sciences, 23 Severnaya Dvina Emb., 163000, Arkhangelsk, Russia https://orcid.org/0000-0002-0817-7105 Author Bolotov, Ivan N. N. Laverov Federal Center for Integrated Arctic Research, Ural Branch of the Russian Academy of Sciences, 23 Severnaya Dvina Emb., 163000, Arkhangelsk, Russia & Northern (Arctic) Federal University, 17 Severnaya Dvina Emb., 163002, Arkhangelsk, Russia https://orcid.org/0000-0002-3878-4192 text Zoosystematics and Evolution 2020 96 2 577 608 http://dx.doi.org/10.3897/zse.96.52860 journal article http://dx.doi.org/10.3897/zse.96.52860 1860-0743-2-577 D4882E78D81B5FA394A6A156886835E4 3. Radix (Radix) brevicauda (G.B. Sowerby II, 1872) Fig. 3D, E ; Table 1 Limnaea brevicauda G.B. Sowerby II 1872: pl. XV, fig. 105. Limnaea brevicauda - Hanley and Theobald 1876 : 64, pl. 158, fig. 7; Annandale and Rao 1925 : 157, figs 1-6. Lymnaea (Radix) brevicauda - Subba Rao 1989 : 134, figs 302, 303. Radix brevicauda - Gloeer and Boessneck 2013 : 153, figs 61-63. TL. The type locality was originally stated as 'Australia' ( Sowerby 1872 ). It is, however, erroneous. Hanley and Theobald (1876) gave the proper type locality: Kashmir. Types. NHMUK. The syntypes were inspected by us. R. brevicauda inhabits Northern India (Kashmir), Nepal, China (Western Tibet and Himalaya Range) and, probably, Tajikistan (Pamir Mts.) [ Subba Rao 1989 ; Gloeer and Boessneck 2013 ; Aksenova et al. 2018a ]. The record of this species from Tajikistan is based on numerous shells from ZISP collection (see Fig. 3E ), virtually identical with the syntypes of R. brevicauda . This species has not been registered from the ex-USSR territory ( Vinarski and Kantor 2016 ) and hereby we, for the first time, include it in the malacofauna of the former Soviet Union. However, this record is still not corroborated genetically. The shell of R. brevicauda is ear-shaped, with low spire and greatly expanded aperture. Generally, in many ways, it resembles the shell of R. auricularia and Gloeer and Boessneck (2013 : 153) note that there are no substantial differences between the two species, which are probable synonyms. However, Annandale and Rao (1925) reported the structure of the jaw and radula of R. brevicauda is distinct from that of R. auricularia . The anatomical structure of the discussed species, described and illustrated by Gloeer and Boessneck (2013) , is typical for the genus Radix . Our molecular analysis recovered R. brevicauda as a species sister to R. auricularia ( Aksenova et al. 2018a ). We may indicate some conchological differences between R. auricularia and R. brevicauda . The latter species is of smaller size, the largest syntype shell is 18.1 mm (our data) and Gloeer and Boessneck (2013) mention that R. brevicauda may reach 20 mm in height. Next, the columellar depression in shells of R. brevicauda is very prominent, whereas, in R. auricularia , it is typically weakly developed (compare Fig. 2A and 2D, E ). Lastly, the spire whorls in R. auricularia are usually flattened, while in R. brevicauda these are visibly convex and rounded. Nomenclature remark. The name Limnaea brevicauda Sowerby is the oldest available one to designate a lymnaeid species, sister to R. auricularia , restricted in its distribution to the Central Asia mountain regions. The taxonomic identity of R. brevicauda , as well its close affinity to R. auricularia , was confirmed by the inspection of the extant syntypes.