Terrestrial crustaceans (Arthropoda, Crustacea): taxonomic diversity, terrestrial adaptations, and ecological functions.

Terrestrial crustaceans are represented by approximately 4,900 species from six main lineages. The diversity of terrestrial taxa ranges from a few genera in Cladocera and Ostracoda to about a third of the known species in Isopoda. Crustaceans are among the smallest as well as the largest terrestrial arthropods.

Biodiversity of aquatic organisms in the Mekong Delta, Vietnam.

Background: The Mekong River is the 10 largest river in the world. It is recognised as the most productive river in Southeast Asia and economically essential to the region, with an estimated 60-65 million people living in the lower Mekong Basin. The Mekong Delta within Vietnam is considered a highly vulnerable ecosystem under threat from increasing anthropogenic pressure, such as dam construction and, as a consequence, the Delta is sinking and altering the natural hydrological cycle.

New data on the distribution and diversity of the Tonkin limestone rat (, Rodentia, Muridae).

The paper presented novel findings of little-known species of rodents the Tonkin limestone rat in Cao Bang Province, Vietnam with its morphological and genetic characterisation. The study summarises data on the distribution of this data-deficient species, available museum collections, genetic samples, information on its taxonomy and ecology, important to establish the proper conservation status of the species. An exhaustive map of the findings is provided.

Taxonomic diversity and abundance of enchytraeids (Annelida, Clitellata, Enchytraeida) in the Northern Palaearctic. 1. Asian part.

Background: Enchytraeids, or potworms, are tiny oligochaetes that are distributed worldwide in many terrestrial, freshwater and marine ecosystems. Despite their key role in the functioning of ecosystems, the diversity and abundance of Enchytraeidae are rarely studied due to the laborious process of species identification. The present study addresses this gap and sheds some light on the distribution and abundance of enchytraeids in the lands of the Northern Palearctic.

On the synonymy of Eskov, 1990 and Marusik, Koponen & Danilov, 2001 (Araneae, Linyphiidae).

Two erigonine genera from East Siberia are synonymized: Marusik, Koponen & Danilov, 2001, = Eskov, 1990. Two new combinations are established: (Marusik, Koponen & Danilov, 2001), and (Marusik & Koponen, 2009), both ex. .

A review of soldier beetles of the genus Podistra Motschulsky, 1839 (Coleoptera: Cantharidae) of the Greater Caucasus, with the description of two new species.

Two new species of soldier beetles of the genus Podistra Motschulsky, 1839 are described from the vicinity of Mount Elbrus, Caucasus: P. (s. str.

Do the Palaearctic subgenera of Podistra Motschulsky, 1839 really occur in North America: description of P. ( Pidostria ), subgen. nov. (Coleoptera: Cantharidae).

A new subgenus, Pidostria subgen. nov., is described in Podistra Motschulsky, 1839 for a North American member of the genus, all the remaining subgenera thus become confined to the Palaearctic region.

Two new species of (Copepoda, Harpacticoida, Canthocamptidae) from the Russian Arctic and comparison with (Claus, 1863).

Two new species of Chappuis, 1929 from the Russian Arctic from the species group are described: and A complete morphological comparison of the new species with the type species (Claus, 1863) was carried out. Significant interspecific differences were shown at the level of microcharacters, such as integumental sensillae and pores, ornamentation of segments of mouthparts and swimming legs, and pores on swimming legs. A significant correlation has also been shown in the shape of the caudal rami of the females and the antennules of the males, which is likely caused by an evolutionary sexual arms race.

A new species of honeycombed Chydorus Leach, 1816 (Cladocera: Anomopoda: Chydoridae) from tundra of North-East Russia.

A new cladoceran of the faviformis-group of the genus Chydorus Leach, 1816 (Cladocera: Chydoridae), characterized by a honeycomb-like sculpture of valves and head shield, is described from tundra lakes and ponds in North-East Russia. Morphology of the new species was studied using optical and scanning electron microscopy. Chydorus izvekovae sp.

New genus of erotine net-winged beetles, Damzenium gen. nov. (Coleoptera: Lycidae), from Eocene Rovno amber.

A new genus and a new species of erotine net-winged beetles, Damzenium rivnense gen., sp. nov.

The role of plants in the formation of species-specific features in grass flies (Diptera, Chloropidae, Meromyza).

In the current manuscript, we present the results of comparative analysis of seven species of flies in the "" cluster and of the evolutionary close species , based the following criteria: 1) 14 external key features; 2) shape and area of the anterior processes of postgonites; 3) mtDNA CO1 region and 4) host plant diversity data. We could demonstrate the primary role of host plants in species formation inside genus and calculated the timing of the divergence of and the species of "" cluster. Based on our estimates of evolution rate for mtDNA CO1 gene, we could conclude that that divergence of herbs happened before the speciation of grass flies .

Contribution to the knowledge of the genus Novikova & Kluge, 1987 (Ephemeroptera, Baetidae) in Central Asia.

Based on the original type material, the nymphal stage of the mayfly is redescribed; in parallel, a lectotype is designated. is the type species of the genus , and an accurate and complete knowledge of its morphology is crucial to the delimitation of this problematic genus and clarification of its phylogenetic affinities. Ambiguous characters, previously reported for this species in the literature are clarified.

Aggregated occurrence records of the invasive alien striped field mouse ( Pall.) in the former USSR.

Background: Open access to occurrence records of the most dangerous invasive species in a standardised format have important potential applications for ecological research and management, including the assessment of invasion risks, formulation of preventative and management plans in the context of global climate and land use changes in the short and long perspective. The striped field mouse ( Pallas, 1771) is a common species in the temperate latitudes of the Palaearctic. Due to land use and global climate changes, several waves of expansion of the range of this species have been observed or inferred.

Overview of Indian and Nepali representatives of the (Uéno, 1928) complex (Ephemeroptera, Ephemerellidae), with discussion about Allen, 1971 species complexes.

The concept of the (Uéno, 1928) (Ephemeroptera: Ephemerellidae) complex is clarified and Indian and Nepali representatives of the complex are reviewed. Four new species are described viz. Martynov & Palatov, , Martynov, Selvakumar, Palatov & Vasanth, , Martynov & Palatov, and Selvakumar, Martynov & Subramanian, The larva of (Braasch, 1981) is re-described, based on the holotype and paratypes.

Occurrence of the amphibians in the Volga, Don River basins and adjacent territories (Russia): research in 1996-2020.

Background: Knowledge about the distribution of living organisms on Earth is very important for many areas of biological science and understanding of the surrounding world. However, much of the existing distributional data are scattered throughout a multitude of sources, such as taxonomic publications, checklists and natural history collections and often, bringing them together is difficult. A very successful attempt to solve this problem is the GBIF project, which allows a huge number of researchers to publish data in one place in a single standard.

New records and geographic distribution of the sympatric zones of unisexual and bisexual rock lizards of the genus in Armenia and adjacent territories.

Background: Caucasian rock lizards of the genus are unique taxa, including both bisexual and parthenogenetic species. The parthenogenetic species have originated as a result of natural hybridisation between females and males of different bisexual species. The species involved in interspecific hybridisation are called parental.

Notable homologous variation in chromosomal races of the common shrew.

This paper is a review of the rare phenomenon of chromosome intraspecies variation manifested in monobrachial homology series in the comprehensively investigated karyotype of the common shrew Linnaeus, 1758 (Eulipotyphla, Mammalia). The detailed dataset on the account of this mammalian species was drawn from the recently published monograph by Searle et al. (2019) "Shrews, Chromosomes and Speciation".

New species of Alpinalona Alonso amp; Sinev, 2017 (Cladocera: Anomopoda: Chydoridae) from South-East USA.

A new species of genus Alpinalona Alonso Sinev, 2017 is described from South-East USA. Alpinalona fornshelli sp. nov.

Revision of the elegans-group of Alona s. lato and its status as a subgenus of Coronatella Dybowski amp; Grochowski, 1894 (Cladocera: Anomopoda: Chydoridae).

The taxonomic status of the elegans-group of Alona s. lato (Cladocera: Anomopoda: Chydoridae) is herein examined. The West Palearctic Alona elegans Kurz, 1875 and poorly known African taxon Coronatella cf.

Genetic analysis confirms the freshwater origin of the endemic Caspian sponges (Demospongiae, Spongillida, Metschnikowiidae).

The Caspian Sea is a unique inland brackish waterbody inhabited by highly endemic fauna. This fauna consists of species of both marine and freshwater origin. Some Caspian invertebrates cannot be confidently referred to as animals of either origin.

Who are you, Griselda? A replacement name for a new genus of the Asiatic short-tailed shrews (Mammalia, Eulipotyphla, Soricidae): molecular and morphological analyses with the discussion of tribal affinities.

The first genetic study of the holotype of the Gansu short-tailed shrew, Thomas, 1912, is presented. The mitochondrial analysis demonstrated that the type specimen of is close to several recently collected specimens from southern Gansu, northern Sichuan and Shaanxi, which are highly distinct from the two species of Asiatic short-tailed shrews of southern Sichuan, Yunnan, and Vietnam, and . Our analysis of four nuclear genes supported the placement of as sister to / , with the level of divergence between these two clades corresponding to that among genera of Soricinae.

А new species of Alona Baird, 1843 (Cladocera: Chydoridae) from the ancient Lake Ohrid.

A new species of Cladocera, Alona begoniae sp. nov. (Anomopoda: Chydoridae) was found in ancient Lake Ohrid.

Description of a new species of the genus Verhoeff, 1917 and redescription of Borutzky, 1957 from the southeast of European Russia (Isopoda, Oniscidea, Agnaridae).

A new species of woodlice, Gongalsky & Turbanov, is described from Kalmykia, NE Pre-Caspian region, Russia. Borutzky, 1957 from the same area is also redescribed. Diagnostic features of these species as well as affinities within the genus are provided and discussed.