Adacna minima Ostroumov 1907

Adacna minima Ostroumov, 1907 (Fig. 4: 2). *1907 Adacna minima Ostroumov: 23, pl. 4, figs. 1���5. 1969 Adacna minima ostroumovi Logvinenko and Starobogatov: 338, fig. 354, 3. 2013 Adacna minima ostroumovi Logvinenko and Starobogatov, 1969 ��� Bogutskaya et al.: 378, fig. 146. Dimensions ��� max. L 16.5 mm, H 12.7 mm. Characterization ��� Relatively small subtriangular to subrounded Adacna; shell thin, slightly more convex than other Adacna species and in outline resembling some Monodacna species, but hinge plate very thin, edentulous with the exception of juvenile stages where a small cardinal tooth in LV can be present that disappears in adult stages; dorsal margins usually more or less straight; ribs low, flat regularly spaced and fading towards anterior and posterior margins; in our material specimens with relatively well developed low ribs to almost smooth specimens and intermediates occur; well-developed growth bands in our material. Ecology ��� Species occurs mainly in the middle and south-east of the CS, less often in the north CS (Logvinenko and Starobogatov, 1969). Endemic species living in water with a salinity of at least 5���8 psu, preferably muddy, sandy-muddy and, rarely, sandy bottoms, mainly in the middle and south CS at depths of
Published as part of van de Velde, Sabrina, Yanina, Tamara A., Neubauer, Thomas A. & Wesselingh, Frank P., 2020, The Late Pleistocene mollusk fauna of Selitrennoye (Astrakhan province, Russia): A natural baseline for endemic Caspian Sea faunas, pp. 1227-1239 in Journal of Great Lakes Research 46 (5) on page 1231, DOI: 10.1016/j.jglr.2019.04.001, http://zenodo.org/record/5019200
{"references":["Ostroumov, A. A., 1907. On mollusks of the Aral Sea. Izv. Turkest. Otd. Imp. Rus. Geogr. Obs. 4, 20 - 26.","Logvinenko, B. M., Starobogatov, Y. I., 1969. Mollusca, in: Birshtein, Y. A., Vinogradov, L. G., Kondakov, N. N., Kuhn, M. S., Astakhova, T. V., Romanova, N. N. (Ed.), Atlas Bespozvonochnykh Kaspiyskogo Morya [Atlas of Invertebrates of the Caspian Sea]. Pishchevaya Promyshlennost (Vsesoyuznyi Nauchno-issledovatel'skii Institut Morskogo Rybnogo Khozyaistva i Okeanografii), Moscow, pp. 308 - 385.","Bogutskaya, N. G., Kijashko, P. V., Naseka, A. M., Orlova, M. I., 2013. Identification keys for fish and invertebrates. Volume 1: Fish and molluscs. KMK Scientific Press Ltd., St. Petersburg - Moscow."]}