Volume 35

Volume 35 part 2

Keywords
new species; Spratly Islands; Tho Chu Islands; Vietnam;
Pages
pp. 53 -
64

Based on specimens collected during the field trips in 2019–2020, 2023 in the Tho Chu Islands and Spratly Islands (Truong Sa Islands), Vietnam, we have identified five species of the genus Viriola. Two of them, namely Viriola thochuensis n. sp., Viriola namyitensis n. sp. are new to science. Other three species, namely, V. abbotti, V. bayani, V. intergranosa are the first records for Vietnam. The diagnostic characters and distribution of Viriola species in Vietnam are presented.

Описание новых видов рода Viriola Jousseaume, 1884 (Gastropoda: Triphoridae) из Вьетнама
НГУЕН Тай-Ту; ХОАНГ Зыонг Т.Т.;
Jirapatrasilp P.; Thi S.; Chantha N.; Chourn P.; Sophea C.; Jeratthitikul E.; Pholyotha A.; Siriwut W.; Srisonchai R.; Panha S.; Sutcharit C.;
Keywords
Battambang; Cyclophoroidea; Gastropoda; Mollusca; taxonomy;
Pages
pp. 65 -
72

This study reports the first record of the operculate micro land snail from the Alycaeinae, Chamalycaeus aduncus Jirapatrasilp sp. nov., also the first new species of the genus in Cambodia, based on a recent survey in Battambang. This new species is similar to Chamalycaeus excisus (Möllendorff, 1887) and C. excisus sublimus Páll-Gergely et Auffenberg, 2019 from the Philippines, in shell size and shape, and the strongly downwards coiling of R3, but differs in having a shorter R2 without any blunt keel, a round aperture without any incision, and a beak- or hook-like basal edge of the outer peristome.

Первая находка микроскопической наземной улитки подсемейства Alycaeinae (Caenogastropoda, Cyclophoridae) в Камбодже, с описанием нового вида рода Chamalycaeus von Möllendorff, 1897
ДЖИРАПАТРАСИЛП П.; ТХИ С.; ЧАНТХА Н.; ЧУРН Ф.; СОФЕА Ч.; ДЖЕРАТТХИТИКУЛ Э.; ПХОЛЬЙОТА А.; СИРИВУТ В.; СРИСОНЧАЙ Р.; ПАНХА С.; СУТЧАРИТ Ч.;
Tahirova E.N.; Aksenova O.V.; Vinarski M.V.; Kondakov A.V.; Khrebtova I.S.; Travina O.V.; Kropotin A.V.; Snegovaya N.Yu.;
Keywords
Galba cubensis; G. schirazensis; freshwater mollusks; invasive species; DNA Barcoding;
Pages
pp. 73 -
82

In this study, we report the discovery of two invasive freshwater mollusc species belonging to the genus Galba (Gastropoda: Lymnaeidae) on the territory of Azerbaijan. This is the first record of the species Galba cubensis  and G. schirazensis in this country, based on the analysis of morphological traits and sequencing of the mitochondrial cytochrome c oxidase subunit I gene (COI marker). Also, the phylogeographic analyses of both species were performed based on a median-joining network approach of the COI sequences. The find of G. cubensis is the first record of this invasive snail of New World origin in the ex-USSR territory. The taxonomic position of G. schirazensis sensu Kruglov et Starobogatov is discussed.

Два инвазионных вида рода Galba (Gastropoda: Lymnaeidae), новых для фауны Азербайджана
ТАГИРОВА Э.Н.; Аксенова О.В.; Винарский М.В.; Кондаков А.В.; Хребтова И.С.; Травина О.В.; Кропотин А.В.; СНЕГОВАЯ Н.Ю.;
Vortsepneva E.; Kantor Yu.; Agunovich K.; Nikitenko E.; Mikhlina A.;
Keywords
Margarites helicinus; Skeneopsis planorbis; Peringia ulvae; Velutina velutina; Phalium glaucum; Rapana rapiformis; Trigonostoma lamberti; Sydaphera lactea; Admete viridula; simple jaw; complex jaw; rodlets; gnathoblasts;
Pages
pp. 83 -
98

The gastropod feeding apparatus originally comprises the radula and jaws. While the radula has been extensively studied, data on jaws remain limited. Nevertheless, investigating jaw morphology is essential for understanding feeding mechanisms and morphofunctional adaptations. This study addresses this gap by presenting novel data on jaw morphology across a range of gastropod species from various clades, including Vetigastropoda, Littorinimorpha, and Neogastropoda. Based on our data and previously published research, we propose the existence of two distinct types of jaws: simple and complex. Simple jaws (found in the majority of Patellogastropoda and some Neogastropoda) consist of solid plates, whereas complex jaws (found in Vetigastropoda, Caenogastropoda, and Heterobranchia) are composed of both a solid homogeneous layer and a layer of solitary structures, such as rods or hooks, referred to as rodlets (as in some heterobranchs). Electron microscopy data enabled us to homologize the complex jaws of Vetigastropoda and Caenogastropoda. The jaws of representatives from both subclasses exhibit a similar synthesis mechanism, in which a single gnathoblast synthesizes an individual rodlet. The jaws of Neogastropoda and Tonnoidea display considerable diversity, both in their localization within the buccal complex and in their morphology, ranging from paired smooth or complex structures to highly modified structures acting as a stylet. Furthermore, the varied localization of jaws in neogastropods suggests a high potential of the buccal epithelium for the formation of diverse jaw structures.

Особенности морфологии и формирования челюстных структур у некоторых видов брюхоногих моллюсков
ВОРЦЕПНЕВА Е.; КАНТОР Ю.; АГУНОВИЧ К.; НИКИТЕНКО Е.; МИХЛИНА А.;
Keywords
North Pacific; Arctic; biogeography; phylogeny; integrative systematics; biodiversity; Mollusca; trans-Arctic; speciation;
Pages
pp. 99 -
118

The main goal of the present paper is to revise the diversity of the nudibranch genus Ziminella and update the geographic ranges of its species, based on historical museum material and newly collected specimens of Ziminella japonica (Volodchenko, 1941) from the Sea of Japan. We provide morphological examinations, a molecular phylogenetic analysis based on four markers, and species delimitation analyses of Ziminella. Our results indicate that Z. salmonacea (Couthouy, 1838) and Z. circapolaris Korshunova et al., 2017 represent a single species but display some intraspecific variation in the COI marker (up to 2.54% between individuals). The species delimitation analyses cannot explicitly support the distinct status of Z. japonica and Z. vrijenhoeki Valdés et al., 2018, but in this case the minimal interspecific p-distance in COI comprised 7.95%. Moreover, several differences in the coloration and external morphology are found in specimens from the type localities of these two species. We also show that Z. japonica displays high morphological diversity across its putative geographical range. Since this variation could be either intraspecific or interspecific, we suggest that specimens collected outside the type localities and lack molecular data, cannot be precisely identified. The molecular phylogenetic analysis does not support close relationships of the shelf species Z. japonica and the abyssal species Z. abyssa Korshunova et al., 2017, thus a hypothesis of a shelf origin of the latter species cannot be confirmed by the presented data. Finally, we provide novel evidence on the hidden diversity of flabellinids in the deep-sea waters of the Sea of Japan.

Сочетание музейных коллекций и новых молекулярных данных способствует ревизии рода голожаберных моллюсков Ziminella (Nudibranchia)
Екимова И.А.; СТАНОВОВА М.В.; МИХЛИНА А.Л.; Чичвархина О.В.; Щепетов Д.М.;