Search

The paper reviews all available information on the species content, distribution and ecology of brackishwater hydrobiid snails belonging to the genusCaspiohydrobiaStarobogatov, 1970. The annotated list of nominal species with remarks on their taxonomy, nomenclature and distribution is provided as well as photographic images of some type specimens and/or topotypes. In total, the genus includes 31 nominal species distributed almost exclusively within the former Paratethys basin. The lectotype for the speciesC. cylindricaLogvinenko et Starobogatov, 1969 is designated. A short overview of the known habitat preferences of variousCaspiohydrobiaspecies is provided. We considerCaspiohydrobiaa genus of Ponto-Caspian origin, whose range extends southwards to Iraq, Iran and Tajikistan and northwards to West Siberia. The actual species content of the genus as well as its generic independence require a further integrative revision, since most of the nominal species ofCaspiohydrobiaare still known from dried shells only and may actually be synonyms of a few (or even a single) species.

Genus Laevicaspia B. Dybowski & Grochmalicki, 1917 Type species. Rissoa caspia Eichwald, 1838; by subsequent designation (Logvinenko & Starobogatov 1969). Caspian Sea, Pleistocene (?)., Published as part of Anistratenko, Vitaliy V., Sitnikova, Tatiana Ya. & Anistratenko, Olga Yu., 2021, Holotypes for three Caspian gastropods of the family Hydrobiidae tracked down description and taxonomic interpretations, pp. 408-416 in Zootaxa 5027 (3) on page 414, DOI: 10.11646/zootaxa.5027.3.6, http://zenodo.org/record/5449761, {"references":["Eichwald, E. (1838) Faunae Caspii Maris primitiae. Bulletin de la Societe Imperiale des Naturalistes de Moscou, 11 (2), 125 - 174.","Logvinenko, B. M. & Starobogatov, Ya. I. (1969 [\" 1968 \"]) Mollusca. In: Birshtein, Y. A., Vinogradov, L. G., Kondakov, N. N., Kuhn, M. S., Astakhova, T. V. & Romanova, N. N. (Eds.), Atlas bespozvonochnykh Kaspiyskogo morya. Pishchevaya Promyshlennost (Vsesoyuznyi Nauchno-issledovatel'skii Institut Morskogo Rybnogo Khozyaistva i Okeanografii), Moskva, pp. 308 - 385."]}

Genus Clathrocaspia Lindholm, 1930 Type species. Caspia pallasii Clessin & W. Dybowski in W. Dybowski, 1887; by original designation (Lindholm 1930: 313). Caspian Sea, Recent. There are seven species of Clathrocaspia presently accepted within the Ponto-Caspian region; two inhabit only the Black Sea and five are endemic to the Caspian Sea (Anistratenko et al. 2021)., Published as part of Anistratenko, Vitaliy V., Sitnikova, Tatiana Ya. & Anistratenko, Olga Yu., 2021, Holotypes for three Caspian gastropods of the family Hydrobiidae tracked down description and taxonomic interpretations, pp. 408-416 in Zootaxa 5027 (3) on page 411, DOI: 10.11646/zootaxa.5027.3.6, http://zenodo.org/record/5449761, {"references":["Lindholm, W. A. (1930) Drei interessante Wasserschnecken (Gastropoda) aus dem westlichen Turkestan. Doklady Akademii Nauk SSSR, 1929, 311 - 314.","Dybowski, W. (1887 - 1888) Die Gasteropoden-Fauna des Kaspischen Meeres. Nach der Sammlung des Akademikers Dr. K. E. v. Baer. Malakozoologische Blatter, Neue Folge, 10 (1 - 3), pp. 1 - 64 (Issue 1, 1887), pp. 65 - 79 (Issue 2, 1888), pls. 1 - 3 (issue 3, 1888).","Anistratenko, V. V., Neubauer, T. A., Anistratenko, O. Yu., Kijashko, P. V. & Wesselingh, F. P. (2021) A revision of the Pontocaspian gastropods of the subfamily Caspiinae (Caenogastropoda: Hydrobiidae). Zootaxa, 4933 (2), 151 - 197. https: // doi. org / 10.11646 / zootaxa. 4933.2.1"]}

Clathrocaspia isseli (Logvinenko & Starobogatov, 1969) Fig. 2a–d Pyrgula (Caspia) isseli Logv. et Star. sp. n. — Logvinenko & Starobogatov 1969: 378, fig. 367(6). Pyrgula isseli Logvinenko et Starobogatov, 1968 — Kantor & Sysoev 2006: 100, pl. 45, fig. P. Clathrocaspia isseli (Logvinenko & Starobogatov, 1969) — Wesselingh et al. 2019: 70. Clathrocaspia isseli (Logvinenko & Starobogatov, 1969) — Anistratenko et al. 2021: 174, fig. 12i–l, q. Type material. Holotype (ZIN 1 /532-2021) and 32 paratypes (ZIN 2 /532-2021) derive from the same lot, labeled “50/1957” (Tab. 1, locality 16), collected by B.M. Logvinenko off Cheleken Peninsula on 4 August 1957. Further 128 paratypes (ZIN 3 /532-2021–8/532-2021, 11/532-2021 and 12/532-2021) are stored in eight separate tubes, labels only marked with the number of station and year, collected in various parts of the Middle (Tab. 1, locality 2) and South (localities 14, 15, 16, 17, 21, 42) Caspian Sea between 26 June 1956 and 2 August 1957 (Fig. 1). Type locality. Originally given as “Southern Caspian Sea between 40–75 m water depth” without further details (Logvinenko & Starobogatov 1969). The holotype was collected in the Caspian Sea off the Cheleken Peninsula, Turkmenistan (Table 1, locality 16) from 71 m depth. Remarks. Recently rediscovered material determined by Starobogatov as the paratypes of C. isseli contain a variety of morphologies. Some match the typical C. isseli as described by Logvinenko & Starobogatov (1969) and the morphology of the holotype (Fig. 2a, b). However, some paratypes (Fig. 2i, j, o–r) resemble C. pallasii (Clessin & W. Dybowski in W. Dybowski, 1887) closely and study of these and additional material confirms that some of the paratypes were classified under that species correctly (Anistratenko et al. 2021). Despite their overall similarity in shell shape, C. pallasii can be distinguished from C. isseli by the consistently lower whorl base, the less convex whorl profile, the slightly detached aperture and the larger and more bulbous protoconch. Clathrocaspia isseli differs from C. gmelinii (Clessin & W. Dybowski in W. Dybowski, 1887) in its more slender shape (see Anistratenko et al. 2021 for further details). Distribution. Endemic to the Caspian Sea, only known from 8 localities (see above) in the Middle and South Basins from water depths of 40 and 107 m. Also found in the Holocene deposits of the Kura delta (Anistratenko et al. 2021)., Published as part of Anistratenko, Vitaliy V., Sitnikova, Tatiana Ya. & Anistratenko, Olga Yu., 2021, Holotypes for three Caspian gastropods of the family Hydrobiidae tracked down description and taxonomic interpretations, pp. 408-416 in Zootaxa 5027 (3) on page 412, DOI: 10.11646/zootaxa.5027.3.6, http://zenodo.org/record/5449761, {"references":["Logvinenko, B. M. & Starobogatov, Ya. I. (1969 [\" 1968 \"]) Mollusca. In: Birshtein, Y. A., Vinogradov, L. G., Kondakov, N. N., Kuhn, M. S., Astakhova, T. V. & Romanova, N. N. (Eds.), Atlas bespozvonochnykh Kaspiyskogo morya. Pishchevaya Promyshlennost (Vsesoyuznyi Nauchno-issledovatel'skii Institut Morskogo Rybnogo Khozyaistva i Okeanografii), Moskva, pp. 308 - 385.","Kantor, Yu. I. & Sysoev, A. V. (2006) Morskiye i solonovatovodnyye bryukhonogiye mollyuski Rossii i sopredel'nykh stran: illyustrirovannyy katalog. KMK Scientific Press, Moscow, 372 pp., 140 pls.","Wesselingh, F. P., Neubauer, T. A., Anistratenko, V. V., Vinarski, M. V., Yanina, T., ter Poorten, J. J., Kijashko, P. V., Albrecht, C., Anistratenko, O. Yu., D'Hont, A., Frolov, P., Martinez Gandara, A., Gittenberger, A., Gogaladze, A., Karpinsky, M., Lattuada, M., Popa, L., Sands, A. F., van de Velde, S., Vandendorpe, J. & Wilke, T. (2019) Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys, 827, 31 - 124. https: // doi. org / 10.3897 / zookeys. 827.31365","Anistratenko, V. V., Neubauer, T. A., Anistratenko, O. Yu., Kijashko, P. V. & Wesselingh, F. P. (2021) A revision of the Pontocaspian gastropods of the subfamily Caspiinae (Caenogastropoda: Hydrobiidae). Zootaxa, 4933 (2), 151 - 197. https: // doi. org / 10.11646 / zootaxa. 4933.2.1","Dybowski, W. (1887 - 1888) Die Gasteropoden-Fauna des Kaspischen Meeres. Nach der Sammlung des Akademikers Dr. K. E. v. Baer. Malakozoologische Blatter, Neue Folge, 10 (1 - 3), pp. 1 - 64 (Issue 1, 1887), pp. 65 - 79 (Issue 2, 1888), pls. 1 - 3 (issue 3, 1888)."]}

Jelly-like microbial mat samples were collected from benthic surfaces at the St. Petersburg methane seep located in Central Baikal. The concentrations of certain ions, specifically chloride, bromide, sulphate, acetate, iron, calcium, and magnesium, were 2–40 times higher in the microbial mats than those in the pore and bottom water. A large number of diatom valves, cyanobacteria, and filamentous, rod-shaped and coccal microorganisms were found in the samples of bacterial mats using light, epifluorescence and scanning microscopy.Comparative analysis of a 16S rRNA gene fragment demonstrated the presence of bacteria and archaea belonging to the following classes and phyla: Betaproteobacteria, Gammaproteobacteria, Deltaproteobacteria, Verrucomicrobia, Cytophaga-Flavobacteria-Bacteroidetes, Cyanobacteria, and Euryarchaeota. The chemical composition and phylogenetic structure of the microbial community showed that the life activity of the mat occurs due to methane and its derivatives involved. Values of δ13C for the microbial mats varied from −73.6‰ to −65.8‰ and for animals from −68.9‰ to −36.6‰. Functional genes of the sequential methane oxidation (pmoA and mxaF) and different species of methanotrophic bacteria inhabiting cold ecosystems were recorded in the total DNA. Like in other psychroactive communities, the destruction of organic substances forming formed as a result of methanotrophy, terminates at the stage of acetate formation in the microbial mats of Lake Baikal (1,400 m depth). Its further transformation is limited by hydrogen content and carried out in the subsurface layers of sediments.