Keywords
new species; new name; Buccinum kosyanae; Buccinum fedosovi;
Pages
pp. 1 -
5

The new species, Buccinum kosyanae sp. nov. is described from the Middle Kurile Islands. Previously the species was included in multigene molecular phylogeny of the genus [Kantor et al., 2022b] as B. cf. kobyakovae. The new name, B. fedosovi nom. nov. is proposed for Buccinum solidum Golikov et Sirenko, 1988, non Buccinum solidum Philippi, 1887.

Новый вид Buccinum (Neogastropoda: Buccinidae) с Курильских островов
Кантор Ю.И. ; Сиренко Б.И.;
Keywords
Leptoplax duongi; Leptoplax unica; new species;
Pages
pp. 7 -
14

The paper deals with two species of chitons of the genus Leptoplax, L. unica and L duongae sp. nov. collected in the South China Sea off the Spratly Islands. The new species differs from morphologically similar species of the genus by the sculpture of the jugum, absence of notch on the anterior margin of apophyses of the tail valve, rounded shape of pustules of tegmentum and distinctly ribbed dorsal girdle spicules.

Моллюски рода Leptoplax (Mollusca: Polyplacophora) островов Спратли Южно-Китайского моря
Сиренко Б.И. ;
Keywords
subepidermal spicules; spiculogenesis; rhinophore; tubercle; organogenesis;
Pages
pp. 15 -
34

Regenerative capabilities vary among different groups of invertebrates and despite being a highly abundant and diverse group of invertebrates with significant commercial and scientific value, gastropods remain relatively understudied in this respect. This work presents the first investigation of post–traumatic regeneration in the nudibranch mollusc Doridina, specifically focusing on Onchidoris muricata. Dorids have unique subepidermal calcite spicules that form a complex network inside the body. However, their capacity for complete or partial recovery, as well as the impact on regeneration of organs containing these spicules, has never been studied. We examined the regeneration of chemosensory organs (rhinophores) and dorsal body outgrowths (tubercle), both containing spicules and having different innervation. Our investigation explores three models of rhinophore regeneration: 1) after the removal of the apex and three lamellae of the rhinophore, 2) when the entire metameric lammelae part is removed, and 3) when the rhinophore is entirely excised. Additionally, two series of experiments were conducted to examine tubercle regeneration in the peribranchial region and in the rhinophore region. The study reveals varying regenerative abilities of these organs, likely linked to their different innervation patterns. Notably, we observed that the presence of the apex and spicules de novo synthesis influence the formation of the first rhinophore lamellae. The search for new patterns and mechanisms underlying the restoration of elements in the nervous system, muscular system, and solid skeleton can significantly contribute to our understanding of regenerative biology. This research expands our knowledge of nudibranch molluscs regeneration and the unique restoration of the subepidermal spicule complex. Furthermore, the regeneration of spicule-containing organs can be a model for studying the formation and structure of biomineralized structures, including their organic component.

Регенерация у дорид на примере Onchidoris muricata (Nudibranchia, Gastropoda, Mollusca)
Никитенко Е.Д.; Анисенко А.Н.; Ворцепнева Е.В.;
Keywords
Indo-West Pacific; Fionidae; Mollusca; integrative systematics; biodiversity; species delimitation;
Pages
pp. 1 -
8

A new species belonging to the Fionidae (sensu Cella et al., 2016), Eubranchus flexus sp. nov. is described based on specimens collected in Nha Trang, Vietnam, South China Sea, Indo-West Pacific, from the upper sublittoral depth. An integrative analysis was conducted, including a molecular phylogenetic analysis based on three markers (COI, 16S, H3), and an analysis of the external and internal morphology using light and scanning electron microscopy. The distinctiveness of Eubranchus flexus sp. nov. is well established both morphologically and genetically. Phylogenetically Eubranchus flexus sp. nov. represents a derived branch in the phylogeny of Eubranchus, but its relationships with other Eubranchus species are unresolved likely due to low taxon sampling. Eubranchus flexus sp. nov. is the first representative of the genus Eubranchus for the nudibranch fauna of Vietnam and for now its range is restricted only to the type locality.

Новый вид рода Eubranchus (Gastropoda: Nudibranchia) из прибрежных вод Вьетнама
Гришина Дарья Ю.; Антохина Татьяна И.; Екимова Ирина А.;
Keywords
bivalves; anodontins; larvae; scanning electron microscopy; Kamchatka;
Pages
pp. 9 -
17

Using light and scanning electron microscopy the first data on morphology of mature glochidia of freshwater bivalve Beringiana beringiana from Dalneye Lake in Kamchatka were received. Based on literature data a comparison with glochidia from other populations of this species is given. Among the Russian Far East populations of the discussed species, glochidia from the Dalneye Lake were the smallest, with shell sizes up to 287 µm and with a hook that does not exceed 1/3 of the glochidium height. Microsculpture of the outer surface of glochidia was tight-looped all over the whole valves.

Первые данные о морфологии глохидиев двустворчатых моллюсков Beringiana beringiana (Bivalvia, Unionidae) озера Дальнее, Камчатка
Саенко Е.М.; Вецлер Н.М.;
Keywords
systematics; terrestrial snails; forests over limestone; Pupinidae; Hoa Binh;
Pages
pp. 19 -
26

Chuatienpupa megacanalis gen. et sp. nov. is described from Hoa Binh province, northern Vietnam. Chuatienpupa gen. nov. is characterized by a small, pupoid-shaped, smooth, glossy shell. Peristome with two canals; anterior canal twisted funnel-shaped, appearing as a very wide groove, opening on the basal side; posterior canal continues vertically upward and forming a wide groove, which is divided by the upper palatal plica. The operculum bowl-shaped, strongly convex, its outer surface smooth, glossy, and covered by a glaze. Both shell and opercular characters distinguish this new genus from other Southeast Asian pupinid genera. General shell morphology of Chuatienpupa gen. nov. is most similar to Pupina Vignard, 1829. However, the new genus differs in having two palatal and basal plicae, a twisted anterior canal, opening on the basal side, and a solid, bowl-shaped operculum, with outer surface dome-shaped and completely smooth.

Новый род и новый вид Pupinidae (Gastropoda: Caenogastropoda) из северного Вьетнама
До Д.С.; Нгуен Т.Ш.;
Keywords
Chitons; molluscs; South America; taxonomy; phylogeny;
Pages
pp. 27 -
45

Here we present detailed morphological and molecular comparison of the Tonicia species and ecotypes along Southeastern Pacific coast. Several specimens were examined by scanning electron microscopy and based on plates morphology we propose a new taxonomic key for identification of species and ecotypes of Tonicia. A total of 566 specimens were measured to explore morphological differences between ecotypes and ecoregions by means of multivariate analyses. Genetic distances and a maximum likelihood (ML) phylogeny were estimated using Cytochrome Oxidase I (cox1) to compare species and ecotypes. Morphometry and multivariate analyses revealed morphological differences between ecotypes in each species. However, cox1 genetic distances were low between ecotypes in both species (T. calbucensis and T. chilensis) and the ML phylogeny revealed an absence of monophyletic relationships between ecotypes in each species clades. The new key will be useful to identify Tonicia species by morphology without molecular analysis.

Сравнительная морфология географических экотипов Tonicia (Polyplacophora) юго-восточной Пацифики
Сиренко Б.И.; Ибаньез К.М.;
Keywords
Western Siberia; fauna; distribution; identification key;
Pages
pp. 47 -
57

The work is based on a study of long-term collections of molluscs of the family Bithyniidae from the waterbodies of the Tyumen region (Western Siberia), located within the world's largest Ob-Irtysh natural focus of opisthorchiasis. Difficulties with species identifications of bithyniid snails, the first intermediate hosts of Opisthorchis, necessitate the publication of photographic images of Bithyniidae shells and an identification key based on discrete morphological characters. It has been established that 14 species of Bithyniidae belonging to five genera inhabit the Tyumen region, an annotated list of species is given, and a brief zoogeographical description is given. The most abundant species are Digyrcidum starobogatovi and Boreoelona sibirica, whereas Paraelona milachevitchi were found solitary.

Моллюски семейства Bithyniidae (Mollusca, Gastropoda) Тюменской области
Андреева С.И.;
Keywords
Helicoidea; genitalia; different chirality; new species; Yunnan;
Pages
pp. 59 -
71

A new camaenid Aegistohadra baii sp. nov., close to Aegistohadra delavayana but having smaller and more conical shell and anatomically different, was described from Yunnan, southwest China. Helix seraphinica Heude, 1889 was confirmed to be an Aegistohadra species based on structure of genital organs. Cryptozona yunlongensis Chen Y., Chen D. et Zhang, 1997 is transferred to Aegistohadra based on shell and genital characters.

Новый вид Aegistohadra (Gastropoda: Camaenidae) из юго-западного Китая
Ву М.;
Keywords
new species; Alaska Bay; radula;
Pages
pp. 73 -
77

Described is a new species of the genus Stenosemus from the Gulf of Alaska. It differs from the other species of this genus from the Northeast Pacific by having longitudinal undulating folds in the pleural areas of the intermediate valves, flattened, smooth dorsal calcareous corpuscules on perinotum and rectangular central teeth of radula.

Stenosemus undatopleuralis sp. nov. (Mollusca: Polyplacophora) из северо-восточной Пацифики
Сиренко Б.И.;
Keywords
deep-water genera; Indonesia; Banda Sea; age variability;
Pages
pp. 79 -
94

On the basis of the collections of the R/V Vityaz in the Banda Sea, Indonesia, a review of the chiton fauna of the genera Belknapchiton and Leptochiton was carried out. Leptochiton commandorensis, until now known only from the northern Pacific near the Commander Islands, is here added to the four known Indonesian deep sea species. This species turned out to be with juveniles in the pallial groove. A scanning electron microscope study of the collected specimens of B. giganteus made a corrected, supplemented description of this rare species possible. The age variability of the valves shape and shell sculpture of the two collected species was studied. Particular attention is paid to the age variability of the number of micraesthetes on the tegmentum grains and the position of the mucro.

Индонезийские хитоны родов Belknapchiton Sirenko, Saito and Schwabe, 2022 и Leptochiton Gray, 1847 (Mollusca: Polyplacophora: Lepidopleuridae)
Сиренко Б.И. ;
Keywords
morphological properties; pulmonate mollusks;
Pages
pp. 95 -
104

In terrestrial pulmonate gastropods Cochlodina laminata, Monachoides incarnata, Helicigona lapicida, Arianta arbustorum, Cepaea hortensis, Trochulus hispidus and Succinea putris, the morphological properties of the pupil of camera-like eyes were studied for the first time: location, spatial orientation, change in spatial orientation, structure, shape, shape change, relative size, change in relative size. Several methods were used in the work: making of preparations of isolated eyes, making of histological preparations of eyes, light microscopy, morphometric analysis, statistical analysis, calculations. All the studied morphological properties of the pupil of the camera-like eyes of C. laminata, M. incarnata, H. lapicida, A. arbustorum, C. hortensis and T. hispidus are similar to the analogous morphological properties of the pupil of the camera-like eyes of other species of terrestrial pulmonates. One of the studied morphological properties of the pupil of the camera-like eye of S. putris – the relative size – differs from the analogous morphological property of the pupil of the camera-like eyes of other species of terrestrial pulmonates.

Зрачок камерных глаз наземных брюхоногих моллюсков (Heterobranchia, Stylommatophora)
Шепелева И.П.;
Vinarski M.V.; Stojko T.G.; Komarova E.V.; Aksenova O.V.; Kondakov A.V.; Khrebtova I.S.;
Pages
pp. 105 -
114

The article reports the finding of a population of freshwater snails morphologically and genetically identified as Ladislavella cf. terebra (Westerlund, 1885), in a reservoir situated in Penza City. This is the first reliable record of representatives of the genus Ladislavella on the territory of European Russia, at a considerable distance from the previously known boundaries of its range. Molecular data suggest that the examined population belongs to the previously unknown species of Ladislavella. The morphoanatomic and ecological characteristics of the studied population and some information about parasites and commensals of mollusсs are given.

Первое молекулярное подтверждение обитания рода Ladislavella (Gastropoda: Lymnaeidae) в европейской части России
Винарский М.В.; Стойко Т. Г.; Комарова Е.В.; Аксенова О.В.; Кондаков А.В.; Хребтова И.С.;
Keywords
Clausiliidae; juvenile; shell; identification; fauna; area; habitat; distribution;
Pages
pp. 115 -
10

This study examines and provides illustrations of the diagnostic shell characteristics of juvenile and adult of Crimean clausiliids Balea perversa. The study demonstrates that the distinctive sculpture and shape of the shells make it possible to accurately differentiate Balea perversa. Additionally, the study includes information on previous references in the literature and recent findings of Balea perversa in the Crimea region, including a discovery on the Southern Demerdzhi Yayla in 2002. The study confirms the reliability of at least the last finding.

О достоверности находок Balea perversa (Gastropoda: Pulmonata) в Крыму
Леонов С. В.;
Pages
pp. 121 -
127

Chicomurex kozlovi sp. nov., collected from the Saya de Malha Bank in the Mascarene Plateau, Western Indian Ocean, is described and illustrated. The holotype was sampled at a depth of 200 m during the expedition of R/V Gordy in 1989, while paratypes 1 and 2 were trawled from a depth of 100-200 m by research-fishery boats during the eighties. Chicomurex kozlovi sp. nov. is compared with morphologically similar congeneric species.

Новый вид рода Chicomurex (Gastropoda, Muricidae) с банки Сайя де Малья, западная часть Индийского океана
Бондарев И.П.;
Pages
pp. 129 -
136

The taxonomic and biogeographical composition of gastropod molluscs in the antique part of the fund collection of the State Historical and Archaeological museum-preserve Tauric Chersonese was diagnosed and analyzed. The complex of molluscs includes species from the Black Sea, Mediterranean, and Indo-Pacific groups. The shells of the European horn of Triton Charonia seguenzae were found only in Chersonese. To establish probable trade links between Chersonese and the Scythian-Sarmatian and Goth-Alanian worlds, the studied mollusc complex has been compared with archaeological finds in the Crimea and beyond. The biogeographical composition of mollusc complexes from the archaeological layers of Chersonese and "barbarian" necropolises has been shown to be identical, indicating the unity of the sources and the import route of shells.

Раковины морских брюхоногих моллюсков из культурных слоев и некрополя Херсонеса Таврического как трассеры торговых и культурных связей в античное время
Бондарев И.П.; Букатов А.А.; Вахонеев В.В.;
Keywords
conchological features; geometric morphometry;
Pages
pp. 137 -
147

The aquatic gastropod Lymnaea stagnalis exhibits a high variability of conchological features. To assess the degree of variation in the size and shape of the shell in the populations of this species inhabiting the Central Russian Upland, a comparative analysis was carried out using the methods of classical and geometric morphometry. A pairwise comparison of populations using the Post-hoc test for perMANOVA has shown that when using geometric morphometry, there were more statistically significant differences between the groups of snails compared than when using classical conchiometric analysis. In addition, the pattern of distribution of populations by groups during clusterization differed significantly when using different morphometric methods. We believe that the methods of geometric morphometry, which make it possible to give an integral characteristic of the shell, are better suited for understanding the patterns of microevolutionary processes in populations of gastropods, as well as studying the ecological characteristics of species. Nevertheless, in order to prevent the loss of important conchiometric data that can be used for species identification and assessment of intra- and inter-population variability, when using geometric morphometry, it is also important to take into account the absolute dimensional characteristics of the object of study.

Оценка изменчивости конхиологических признаков Lymnaea stagnalis с использованием методов классической и геометрической морфометрии
Снегин Э.А.; Юсупов С.Р.; Юсупова А.Ю.;
Pages
pp. 149 -
165

A revision of Black Sea chitons of the genus Lepidochitona has been conducted. The revision revealed new features of intrageneric similarity and differences of Black Sea species as well as with Mediterranean species. Species similarity of Black Sea and Mediterranean representatives of Lepidochitona cinerea is confirmed. A new species L. bondarevi sp. nov. is described. Previously its specimens were attributed erroneously to L. caprearum. The new species differs from L. caprearum in having a less broad head valve, shorter apophyses, a much longer postmucronal area on the tail valve, 7–8 longitudinal grooves around the upper half of dorsal girdle spicules and smooth dorsal girdle needles.

Lepidochitona bondarevi sp. nov. (Mollusca: Polyplacophora) из Черного моря и его родственники
Сиренко Б. И.;
Keywords
invasiveness; shell formation; morphometric ratios; index of roundness;
Pages
pp. 167 -
174

Molluscs of the genus Corbicula, first discovered in the lower Don River (Novocherkasskaya TPP warm channel area) in 2017, were identified as Corbicula fluminea based on their conchological features.  The aim of the present work was to obtain new data on morphometry and peculiarities of shell-shape forming of molluscs of this species from the Don River in ontogenesis. Using the main morphometric parameters of the shell – length (L), width (D) and height (H) – changes in its frontal (D/L), sagittal (H/L) curvature (=Index of Roundness), convexity ((H+D)/L) and conditional volume (H×D×L/1000) indices during ontogeny were shown. The relevant equations of dependencies are given. The conclusion was made about the interval type of changes in the indicated curvature indices, which determine the corresponding changes in the relative volume of the shells in ontogenesis.. Their graphs have a dome-shaped character with reaching values in the range of shell lengths 15–25 mm, reliably exceeding similar values in the intervals up to 15 and more than 25 mm. Sexual maturation and the onset of reproduction of molluscs occurs at the stage of increasing relative shell volume. This strategy of shell formation, aimed at creating the maximum internal relative volume of the shell during the period of gonad formation, especially in the androgenic C. fluminea, which incubates larvae, may be one of the characteristics that determine the reproductive capacity of the species and, consequently, its invasiveness.

Особенности аллометрического роста двустворчатого моллюска-вселенца Corbicula fluminea (Bivalvia: Cyrenidae) из бассейна реки Дон
Живоглядова Л.А.; Ревков Н.К.; Гуськова О.С.; Шкоркин Р.А; Хренкин Д.В.;
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;