On the Transbaikalia territory in the refuge lake 6 species of anodontine bivalves of the genus Amuranodonta, known from different localities in Lower Amur basin, Sakhalin Island and southern Primorye Territory of Russia were recorded: A. lomakini (Zatrawkin et Bogatov, 1987), A. boloniensis Zatrawkin et Bogatov, 1987, A. kijaensis Moskvicheva, 1973, A. sitaensis Bogatov et Starobogatov, 1996, A. parva Moskvicheva, 1973, and A. pulchra Bogatov et Starobogatov, 1996. Morphology of shells and soft bodies of discovered species are described, while interspecific differences are estimated by different methods. Basing on the reliability of estimates of interspecific differences, only 4 valid species could be recognized.

The molluscs Elia (Caucasica) novorossica were discovered in the riverside woods in the southern part of Lugansk Region in October 2008. To this day distribution of the genus Elia was restricted to Caucasus, Turkey, maritime territories of Syria and Palestine, while species of the subgenus Caucasica were found exclusively in Caucasus and Northern Turkey.

A description and illustrations of the bivalve mollusks Cuspidaria (Nordoneaera) trosaetes Dall, 1925 (Cuspidariidae) recorded in Russian waters of the Sea of Okhotsk, near southern Sakhalin at a depth of 185-417 m are given.

The validity of the north-western Pacific Gari (Gobraeus) kazusensis (Yokoyama, 1922) (Psammobiidae) previously synonymized with Gari (Gobraeus) californica (Conrad, 1849) from the eastern Pacific is established with a re-description of the former species provided with a detailed synonymy. Records of G. kazusensis from Kamchatka Peninsula and Kurile Islands are doubtful, and the geographical distribution of this species is limited to northern China, Korea, Japan and southern Primorye (north-western Sea of Japan).

New species Buccinum frausseni sp. nov. and new subspecies Buccinum frausseni gracilis subsp. nov. from the Okhotsk Sea are described. Buccinum scalariforme Møller, 1842 is a senior valid replacement name for Buccinum tenue Gray, 1839, non Schröter, 1805, nec Wood, 1828. Buccinum elatior (Middendorff, 1849) is a junior synonym of Buccinum scalariforme. Buccinum scalariforme rhodium Dall, 1919 is a Pacific allopatric subspecies of this species. Nominative subspecies Buccinum scalariforme scalariforme inhabits North Atlantic and Arctic Seas. Buccinum lyperum Dall, 1919 is probably a valid North- Pacific species.