Volume 32

Volume 32 part 1

Keywords
terrestrial snail; Stenomphalia; Caucasus region;
Pages
pp. 1 -
6

Additional material collected in September 2019 made it possible to clarify the range of conchological variability of Harmozica zangezurica recently described from the Syunik region of Armenia, which largely overlaps with that of Harmozica pisiformis thus rendering impossible the reliable identification of empty shells. At the same time the stability has been proven of a diagnostic feature of H. zangezurica – very long vaginal appendages whose length is approximately equal to the total length of the penis and epiphallus,. This character allows reliable distinguishing of H. zangezurica not only from the conchologically similar species H. pisiformis, but also from other representatives of the genus Harmozica. Some data on the ecology and life cycle of H. zangezurica were obtained.

Harmozica zangezurica (Gastropoda, Pulmonata, Hygromiidae) – криптический вид наземных моллюсков с юга Армении
Гураль-Сверлова Н. В.; Гураль Р. И;
Keywords
Unionidae; glochidia; SEM preparation;
Pages
pp. 7 -
20

Mature glochidia of freshwater bivalves can give additional features for taxonomic revisions. To study morphology of glochidia with the scanning electron microscope (SEM), special collecting techniques, storage and preparation are required. Based on extensive personal experience, an overview of various techniques is presented, both positive and negative. The interactions of chemicals used for the storage of glochidia and dissolution of glochidial tissue are described. Techniques for cleaning and mounting the glochidial shells of Unionidae for investigations by SEM are described and compared.

Методика подготовки раковин глохидиев (Bivalvia, Unionidae) для работы на сканирующем электронном микроскопе
Саенко Е.М.; Казарин В.М.;
Keywords
alien molluscs; population structure; Central Russian Upland; Hygromiidae; Enidae;
Pages
pp. 21 -
39

Studying of the demographic characteristics of populations of alien species at the stage of expansion makes it possible to assess their invasive potential. Field studies of alien terrestrial gastropods Xeropicta derbentina (Gastropoda, Stylommatophora, Hygromiidae), Brephulopsis cylindrica (Gastropoda, Stylommatophora, Enidae) and Harmozica ravergiensis (Gastropoda, Stylommatophora, Hygromiidae) have been carried out in Belgorod city, the southern part of the Central Russian Upland (Russia). All studied species are native to the Black Sea region and the Caucasus; in the southern part of the Central Russian Upland, they have been registered over the past ten years. The population density, demographic structure, and spatial structure have been analyzed for three years of observations (2017, 2019, 2020). During this period, the changes in the population density have been noted for all studied species. The most pronounced changes have been observed in X. derbentina, whose population density has significantly decreased, and the spatial structure has changed from clustered type to random distribution. In addition, the age structure of X. derbentina population had a pronounced change at the beginning of the snail activity season of 2020.

The expansion of the other two invaders, B. cylindrica and H. ravergiensis, is proved as more successful. At the same time, H. ravergiensis is distributed throughout the city. This species has stable population density and random type of spatial population structure on most sites. B. cylindrica has the highest population density: in 2020, it has reached 406 ind./m2 on average, with the maximum of 1215 ind./m2. Meantime, the species keeps the clustered spatial structure, which is explained by both high population density and adaptation to the arid conditions of its natural range.

Демографическая и пространственная структура популяций некоторых чужеродных видов наземных моллюсков на территории Белгорода (Среднерусская возвышенность)
Адамова В.В.; Украинский П.А.; Крымская О.В.;
Keywords
North-West Pacific; Coryphellidae; integrative systematics; biodiversity; pseudocryptic species; species delimitation;
Pages
pp. 41 -
48

A new species of the family Coryphellidae, Coryphella alexanderi sp. nov. is described based on specimens collected in the Kuril Islands, North-West Pacific, from the upper sublittoral to 200 m depth. An integrative analysis was conducted, including a molecular phylogenetic analysis based on four markers (COI, 16S, H3, 28S), an automatic species delimitation method ABGD, and an analysis of the external and internal morphology using light and scanning electron microcopy. The distinctiveness of Coryphella alexanderi sp. nov. is well established both morphologically and genetically, and it differs from externally similar species in radular characters. Phylogenetically Coryphella alexanderi sp. nov. is closely related to Coryphella trophina, which occurs sympatrically in the same geographic and bathymetric ranges. Coryphella alexanderi sp. nov. appears to be restricted to the middle and northern Kuril Islands, which is consistent with the high numbers of endemic taxa in this area.

Новый вид рода Coryphella (Gastropoda: Nudibranchia) из прибрежных вод Курильских островов
Екимова И.А.;
Keywords
Istria; Ruthenica filograna pocaterrae; new subspecies;
Pages
pp. 49 -
52

On the territory of Republic of Croatia a new subspecies of land snails of the clausiliid genus Ruthenica has been found. Illustrated description is presented. New subspecies differs from other in shell shape, semi-apostrophic aperture and sculpture pattern.

Новый подвид Ruthenica filograna (Pulmonata: Clausiliidae) из Хорватии
Егоров Р.В.;

Volume 32, part 2

Keywords
schoolmaster gonate squid; species; subspecies; taxonomy; Bivalvia) from the Sea of Japan;
Pages
pp. 53 -
59

Two subspecies of the schoolmaster gonate squid Berryteuthis magister (Berry, 1913) have been described to date: B. magister nipponensis Okutani et Kubodera, 1987 from the Pacific Ocean off the coast of Japan and Sea of Japan, and B. magister shevtsovi Katugin, 2000 from the Sea of Japan. The gonatid species Gonatus septemdentatus Sasaki, 1915, which was later recognized as a junior synonym of B. magister, was also described from the Sea of Japan. Comparisons among these three taxa and with the nominative subspecies using morphological and ecological features suggest that individuals of the genus Berryteuthis inhabiting the Sea of Japan belong to the species B. septemdentatus (Sasaki, 1915), which should be considered the valid name for this taxon.

Таксономическое положение кальмаров рода Berryteuthis Naef, 1921 (Gonatidae, Oegopsida) из Японского моря
Алексеев Д.О.; Катугин О.Н.; Бизиков В.А.;
Keywords
replacement name;
Pages
pp. 60 -
60

The new replacement name Takashius nom. nov. is proposed to solve the homonymy between the fasciolariid genus Okutanius Kantor et al., 2018 and the hymenopteran genus Okutanius D.R. Smith, 1981.

Takashius nom. nov. (Neogastropoda: Buccinoidea: Fasciolariidae), замещающее название для Okutanius Kantor et al., 2018 non D.R. Smith, 1981
Кантор Ю.И.; Федосов А.Э.; СНАЙДЕР М.А.; БУШЕ Ф.;
Keywords
Gastropoda; type series; taxonomy; synonymy; Neritidae;
Pages
pp. 61 -
68

The nominal species name “Theodoxus dniestroviensis” was commonly accepted as introduced by Put’ in 1972 for neritid snails occurring in the upper part of the Dniester River basin. Currently an earlier publication [Put’, 1957] has been found in which this name is established in accordance with the ICZN guidelines, so the dating should be amended to Put’, 1957.

The type series of Theodoxus dniestroviensis is apparently lost but the samples from the type locality were recently traced in the National Museum of Natural History of the National Academy of Sciences of Ukraine (Kiev). An illustrated comparison of topotypic specimens with other morphotypes of regional river nerites is provided. Given the variation in conchological characteristics observed among the specimens of Th. fluviatilis, we consider Th. dniestroviensis to range within its intraspecific variability. This makes Th. dniestroviensis a junior subjective synonym of Theodoxus fluviatilis (Linnaeus, 1758).

Название брюхоногого моллюска “Theodoxus dniestroviensis Put’, 1972” является младшим субъективным синонимом Th. fluviatilis (L., 1758): решение на основе изучения топотипов
Анистратенко О.Ю.; Дегтяренко Е.В.; Осипова Д.С.; Максименко Ю.В.; Анистратенко В.В.;
Keywords
terrestrial snail; introduced species; alien species; bioinvasion;
Pages
pp. 69 -
80

The first record of the eastern Mediterranean species Monacha claustralis in Western Ukraine is described, where it was found in one urban habitat of Lviv together with a conchologically similar Monacha cartusiana. Based on the results of our research and literature data, the reliability of some anatomical criteria that can be used to differentiate M. claustralis and M. cartusiana has been analyzed. A considerable variability in the length and shape of the vagina in M. cartusiana in Western Ukraine has been demonstrated, which may cause the erroneous identification of some specimens of this species as M. claustralis. The pattern of the present distribution of M. cartusiana in Western Ukraine are also characterized.

Monacha claustralis и M. cartusiana (Gastropoda, Hygromiidae) – два криптических вида антропохорных наземных моллюсков на западе Украины
Гураль-Сверлова Н.В.; Гураль Р.И.;
Keywords
Russian Maritime Territory; R/V Akademik Oparin;
Pages
pp. 81 -
84

Boreotrophon oparini sp. nov., found in the Sea of Japan, off Russian Maritime Territory, is described and illustrated. The type material was sampled at a depth of 40 m (holotype) and 110 m (paratype) during the 64th expedition of R/V Akademik Oparin. Boreotrophon oparini sp. nov. is compared with the sympatric B. candelabrum and other congeneric species.

Новый вид рода Boreotrophon P. Fischer, 1884 (Gastropoda, Muricidae, Pagodulinae) из Японского моря
Бондарев И.П.;