Дальневосточное отделение РАН А.В. РОССИЙСКОЕ ДАЛЬНЕВОСТОЧНОЕ МАЛАКОЛОГИЧЕСКОЕ ОБЩЕСТВО Министерства науки и высшего образования Дальневосточное отделение РАН НАЦИОНАЛЬНЫЙ НАУЧНЫЙ ЦЕНТР МОРСКОЙ БИОЛОГИИ. о биоразнообразии и эволюции моллюсков. 7 Исследование формирования гранул зародышевой плазмы в процессе оогенеза двустворчатого моллюска Ruditapes philippinarum.
Bivalve mollusks of Pacific origin in the Barents Sea
Euopisthobranch mollusks of the order Cephalaspidea (Gastropoda: Heterobranchia) of the Kuril-Kamchatka Trench
Euopisthobranch molluscs of the order Cephalaspidea from the Kuril-Kamchatsky Trench sampling area, but general notes are given for all groups. Scientific research was carried out using the equipment of the research center "Taxon" (http://www.ckp-rf.ru/ckp/3038/?sphrase_id=8879024).
The breeding pattern of abyssal mollusks of the genus Ringiculoides Minichev, 1966
Heterobranchia: Ringiculidae)
The breeding pattern of abyssal molluscs of the genus Ringiculoides the location inside the mantle cavity and the presence of individual dense egg capsules that are not enclosed in the common slime matrix.
Gametes and reproduction of the chemosymbiotic bivalve mollusc Calyptogena pacifica Dall, 1891
Vesicomyidae: Pliocardiinae)
Brief description of bivalve mollusks of the Mayskaya Thermal Electric Plant
Sovetskaya Gavan Bay, Tatar Strait)
We give a brief description of the common species of bivalve molluscs in the study area. The age of the studied molluscs ranged from 1 to 7 years, with an average of 4 years.
Stripes matter: first attempts to resolve
Mollusks as proxies in environmental studies
Distribution of some pelagic larvae of bivalve mollusks in the western part of Chukchi Sea
Microbial aspect of mollusc host species divergence
Distinctivness of the sublittoral and upper bathyal vetigastropod fauna of the Ogasawara Islands
Mollusca: Gastropoda)
These figures show the dominance of tropical/subtropical elements in the vetigastropod fauna in the Ogasawara Islands. The main characteristic of the vetigastropod fauna in the Ogasawara Islands is the relative richness of endemic species.
New data on cladobranch diversity (Gastropoda: Nudibranchia) in Vietnam
Fauna and distribution of bivalves
Fauna and distribution of mussels in the Kuril-Kamchatka Trench, the share of hadal endemics increases significantly (more than 66%), more than a third of them were recorded only at these depths. Fourteen species and morphospecies (42.4%) are endemic to the hadal zone of the Kuril-Kamchatka Trench. Of the 18 species identified, only 6 species (33.3%) were found exclusively in the hadal zone of the trench.
The high species richness and quantitative abundance of mussels in the Kuril-Kamchatka Trench is apparently associated with large amounts of organic matter supplied to the slopes and bottom of the trench, creating favorable conditions for the existence of bivalve populations.
Current malacology: historic impediments and advanced technology
Kantor
When new species are described using molecular methods, the holotype should be selected from sequenced specimens, even if it is incomplete, damaged, or in worse condition than other available specimens. Formal species description based on spent empty shells should be avoided at all costs. When the new species is described on the basis of material not immediately suitable or planned for classification, preference for selection of the holotype should be given to recently collected specimens, specimens containing preserved or dried body in .
If species description is based only on empty shells, preference for holotype selection should be given to shells that have not been chemically processed (eg, bleached).
The diversity of neurotransmission-related molecules in the central nervous system
Kniazkina 1 , Elena Kotsyuba 2 , Aleksander Kalachev 2 , Polina Kameneva 2 , Vyacheslav Dyachuk 2, 3
Parathyasira dunbari (Lubinsky, 1976) was originally described from shelf depths of the northwestern region of the Canadian Archipelago. It was considered a shallow-water high-Arctic species, which is endemic to the Canadian-Greenland region. Later, this species was reported from other locations, such as off the Svalbard archipelago (Kedra et al., 2010) and the Haakon Mosby volcano, Norwegian Sea (Gebruk et al., 2003).
Plasma granules of vasa-positive microbes as a factor in the transition from mitosis to meiosis in gametogenic cells.
Vasa-positive germ plasm granules as a factor in the shift from mitosis to meiosis in gametogenic cells
Vasa-positive germ plasm granules in gametogenic cells of Ruditapes philippinarum nuclear RNAs during germline cell differentiation. Based on our study, it seems likely that mitochondria can release their ribosomes by destroying their own structure, and it could be hypothesized that Vasa plays a role in mitochondrial disassembly. The spread of Vasa-positive GG followed by intramitochondrial and intranuclear Vasa invasion is a single event of germplasm-related structures (GPRS).
Other patterns of the GPRS transformation do not exist during the mitosis-meiosis transition in both oogenesis and spermatogenesis in the clam R.
Skeneidae and Anatomidae in the seas of the Eurasian Arctic
This species is the only representative of the family known from waters east to the Barents Sea. We studied two syntypes of Ganesa bujnitzkii, which are the only known representatives of the species. Due to the similar shell sculpture pattern, we suggest that this species is related to the genus Rugulina Palazzi, 1988.
Study of the latest material from the Barents Sea was able to support grant Council of the President of Russia under grant no.
On the intertidal bivalve fauna
Previously, it was common on the coasts in the eastern and southern parts of the reserve. Previously, it was recorded in the southern part of the reserve in the upper subtidal. Previously, it was registered in the intertidal zone of the southern and eastern parts of the reserve.
In the current intertidal bivalve fauna of the reserve, five families have the highest species richness: Mytilidae, 6 species from 5 genera; Veneridae, 5 species from 4 genera;.
Growth and distribution of the bivalve mollusc Macoma calcarea in the Kara Sea
Going in depth into the evolutionary relationships between two species of the Gibbula genus
Cephalaspidea systematics
Hybrid zone between two mussel species, Mytilus trossulus and Mytilus galloprovincialis,
Pteropods make thinner shells
A tool equipment for a tiny driller
Disentangling the taxonomy of Mercuria Boeters, 1971 using an integrative approach
Despite this decline in diversity, our integrative approach revealed an unexpected species richness of the genus in the Mediterranean region, with morphological and molecular data indicating five species new to science.
Recent and rapid radiation of freshwater snails in the ancient Lake Biwa
Locomotion of Chaetoderma nitidulum (Mollusca: Aplacophora)
Naduvaeva, Elena V. Vortsepneva
Morphology of Onchidorididae’s (Mollusca: Nudibranchia: Doridoidei)
Mollusks associated with Ulva spp
Most gastropods of the intertidal meadow are apparently generalist herbivores and are not associated with any particular algal species. Most of the specimens taken belonged to smaller species that were grazers or litter feeders; however, two species of Nassariidae, which are carnivores or scavengers, were also common. The two species of Cantharidus, reported from Korea and Japan, usually inhabit various types of seaweed and coralline algae in the intertidal and subtidal zones.
Several species of Nassariidae, which can feed on pastures, were also quite common.
An assemblage of mollusks associated and with the high latitude scleractinian coral
Land snail fauna of islands
The diversity of land snails on an individual island also depends on the availability of fresh water and habitats, especially forest, which usually provides the most diverse habitats for molluscs. Wetlands, meadows, shrubs and overgrown cliffs on rocky shores also represent unique land snail habitats with high biodiversity. The four freshwater islands of Popov, Reineke, Polshoi Pelis and Furugelm, measuring at least 3 km², are inhabited by 21-26 species of land snails.
However, two small islands Pakhtusov (0.18 km²) and Klykov (0.15 km²) are inhabited by 22 and 26 land snail species respectively, which is associated with the presence of fresh water sources.
Aquatic and terrestrial molluscs
Aquatic and terrestrial molluscs of the Con Dao Archipelago are also common on hard substrates. We found new for the archipelago larger Liolophura japonica living on large rocks on supralittoral of Con Son Bay. In the intertidal of Con Son Bay near destroyed coral reef, large opisthobranch Aplysia was found feeding on sea grass bed.
Ti nababbaba a kabakiran ti mangrove idiay baybay ti Dam Tre ket nangruna nga agtataeng babaen ti Clupeomorus pellucida nga addaan kadagiti esporadiko a sebbangan ti Littoraria, Monodonta, Tenguella, Nerita ken Cellana.
Species composition and distribution of pelagic larvae of bivalves in Nevelski Strait
Ruditapes philippinarum (Adams et Reeve, 1850), Callista brevisiphonata (Carpenter, 1864), Mercenaria stimpsoni (Gould, 1861) and members of the family not identified to species. Next in terms of species diversity were family Mytilidae: Mytilus trossulus (A.A. Gould, 1850), Crenomytilus grayanus (Dunker) and representatives of the family not identified to species. A greater number of Mytilidae larvae was also recorded at the central stations of the strait - 17 and 38, located at a depth of 10 and 15 m respectively, at a temperature of the surface and underwater layers 17–17.8 and 16.8 ºС.
The larvae of these species were found at the central stations in the strait - 17, 35 and 36, with the depths and temperature indicated above.
Glochidia of Inversiunio johogamensis from Nagara River basin (Honshu Island, Gifu Prefecture, Japan)
Chrome was sprayed immediately after drying the samples on the stump to exclude the possibility of deformation of the hooks and the outer layer of the shell. We looked at the fine structure of the outer surface of the glochid valves with more than 10,000 times magnification. Photographs of glochidia were obtained on a Zeiss MERLIN scanning electron microscope at the Center for Biology and Genetic Engineering for Collective Use of the Federal Scientific Center for East Asian Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences.
If the validity of the mentioned Asian mussels is confirmed (Sano et al., 2017; Klishko et al., 2019), the taxonomic compositions of these 4 genera, so that the relationship between them is not fully understood.
Phylogenetic position of the limpet genus Erginus (Patellogastropoda)
First global phylogeny of the deep-sea gastropod genus Scaphander reveals higher diversity,
Sexual size dimorphism in the scallop Mizuhopecten yessoensis
Silina
The threshold age coincides with the beginning of the senile period of development of scallop ontogeny. Adductor muscle weight for both sexes of scallops at the same age does not differ. A similar trend was found for the adductor muscle weight of the scallops from the wild population.
The gregarious settlement of these bivalves contributes to the reproductive success of the population, so that the energetically precious ovaries can all be fertilized.
The mytilid’s connecting system
Byssal threads are attached to a byssus stalk by cuffs, which look like rings. These mytilids are attached by byssal threads hardly to any surface of biological and anthropogenic substrates. The mechanical properties of byssal fibers depend on the strength of the cohesion of the collagen molecules in these mytilids.
The strength of bisal attachment of these mytilids depends on the time of year and the number of functionally active bisal filaments.
Collection of mollusks from Korea
Korea, Japan, and China are three countries adjacent to eastern Russia, and mollusk samples from these regions are very important to Russian scientists for taxonomic and biogeographic comparisons.
How does the nervous system develop
Radula fine morphology of the Conoidea
Vortsepneva 1 , Yuri I. Kantor 2
The radula of Lophiotoma consists of the two dagger-like marginal teeth attached to the radular membrane. The main difference is the ultrathin morphology of the subradular epithelium containing numerous tonofilaments in Conus, while this epithelium is electron transparent in Clavus and Lophiotoma. The epithelium of Conus participates in tooth rolling, while other two species have a radula membrane and the subradular epithelium probably reinforces the membrane.
Thus, we can conclude that despite the great differences in radular morphology, the main patterns of radula formation are similar throughout the superfamily.
Morphotypes and phylogeny of the marine gastropod genus Tegula in East Asia
The use of aplacophoran comparative and evolutionary genomics
Morphological aspects of spermatogenesis in Calyptogena pacifica
The Calyptogena species are reported to have a continuous gametogenesis and multiple spawning during the year, which can be induced by a change in water flow. Large size spermatozoa may limit their swimming capacity and consequently the size of sperm and the water flow during spawning may be related.
Evolutionary novelty: symbiosis of nudibranch mollusk with denitrifying and diazotrophic prokaryotes
