Do, Duc Sang & Do, Van Nhuong: Family Cyclophoridae in Vietnam (Gastropoda: Cyclophoroidea): the genus Cyclophorus Montfort, 1810. Klishko, O. K., Lopes-Lima, M., Froufe, E. & Bogan, A. E.: Solution of taxonomic status of Unio mongolicus Middendorff, 1851 (Bivalvia: Unionidae) from the type locality in Transbaikalia and history of its taxonomy. Sirenko, B. I.: First finding of a widely distributed Antarctic chiton species (Mollusca: Polyplacophora) in the North Pacific [Leptochiton antarcticus]. Páll-Gergely, B.: Correction of two homnyms and an original spelling of Thach [2018] [Satsuma inkhavilayi nom. nov. pro Satsuma huberi; Amphidromus koonpoi / Amphidromus poi; Amphidromus severnsi improvidus nom. nov. pro Amphidromus severnsi anhi]. Neiber, M. T.: On the phylogenetic relationships of Elbasania Schileyko et Fehér, 2017 (Pulmonata, Helicoidea, Hygromiidae). Bui, Thi Chinh, Do, Van Nhuong, Ngo, Dac Chung & Do, Duc Sang: The land snail family Streptaxidae J. Gray, 1860 from Thua Thien Hue, Vietnam, with description of two new species (Gastropoda: Pulmonata). Skvortsova, V. & Balashov, I.: Land snail Acicula parcelineata (Architaenioglossa: Cyclophoridae: Aciculidae) in Ukraine: distribution, variability, habitat preferences and conservation status. Ekimova, I. A., Antokhina, T. I. & Schepetov, D. M.: "Invasion" in the Russian Arctic: is global Climate Change a real driver? A remarkable case of two nudibranch species [Goniodoris nodosa, Flabellina pellucida]. Schileyko, A.: Mysterious Erepta odontina (Morelet, 1851) (Gastropoda, Pulmonata, Helicarionidae). Sirenko, B. I.: Reinstatement of the genus Terenochiton (Mollusca: Polyplacophora) with a genus diagnosis emendation. Ovchankova, N. B.: Bivalve molluscs of the subfamily Sphaeriinae in the Kama region waterbodies (the Middle Urals, Russia). Adamova, V. V., Snegin, E. A. & Ukrainskiy, P. A.: Morphometric and genetic variability of the alien land snail Xeropicta derbentina (Gastropoda, Pulmonata, Hygromiidae) populations [in Russian]. Soldatenko, E. V., Shatrov, A. B., Petrov, A. A. & Sitnikova, T. Ya.: Sperm ultrastructure in Culmenella rezvoji (Lindholm, 1929) (Gastropoda: Hygrophila). Kolpakov, E. V. & Nadtochy, V. A.: Reliable findings of bivalve molusc Neaeromya compressa (Dall, 1899) (Lasaeidae) in the Sea of Japan [in Russian]. Egorov, R.: Notes on radula of Boucardicus leopardus Emberton, 2002 (Gastropoda: Cyclophoridae: Alycaeidae) and systematic position of the genus Boucardicus Fischer-Piette et Bedoucha, 1965. Bui, Thi Chinh & Szekeres, M.: A new species of the genus Oospira Blanford, 1872 (Gastropoda, Pulmonata, Clausiliidae) from central Vietnam. Snegin, E. A. & Snegina, E. A.: Geographical and chronological variability of the conchological characters of the mollusc Fruticicola fruticum (O. F. Müller, 1774) (Gastropoda; Pulmonata; Bradybaenidae) in the Eastern Europe [in Russian]. New taxa: Cyclophorus implicatus kanhoensis n. ssp., Cyclophorus tamdaoensis n. sp., Haploptychius bachmaensis n. sp., Perrottetia namdongensis n. sp., Oospira haivanensis n. sp.