Taxonomic position of holothurian (Echinodermata, Holothuroidea).

Samples of the holothurian (Djakonov & Baranova in Djakonov, Baranova & Saveljeva, 1958) from the Sea of Japan were studied and the relationships of the genera and , as well as related taxa, were evaluated on the basis of phylogenetic analysis of the mitochondrial DNA COI and 16S rRNA genes. Using three methods, phylogenetic trees were constructed, and the degree of reliability of topological reconstructions was estimated by means of a nonparametric bootstrap test for the neighbor joining (NJ) and maximum likelihood (ML) techniques, as well as by a posteriori probability for Bayesian inference (BI) analysis. Genetic data confirm the validity of the assignment of to the genus Deichmann, 1938.

Towards the taxonomy of Corynoneura Winnertz (Diptera: Chironomidae: Orthocladiinae) from the Russian Far East and Eastern Siberia.

The genus Corynoneura Winnertz is partly revised on the basis of materials from the Russian Far East and Eastern Siberia. Adult male of a new species, C. sikhotealinensis sp.

Review of the genus Pagastia Oliver (Diptera: Chironomidae: Diamesinae) from North America, with description of P. (P.) subletteorum sp. nov.

Illustrated description of the adult male of Pagastia (P.) subletteorum sp. nov.

Three species of Hydrobaenus Fries (Diptera: Chironomidae: Orthocladiinae) from Belarus.

Illustrated descriptions of adult male, pupa and fourth instar larva of Hydrobaenus molleri sp. nov., adult male of H.

Morphological description and DNA barcoding of Chaetocladius (Chaetocladius) elisabethae sp. nov. (Diptera: Chironomidae: Orthocladiinae) from the Moscow Region.

Illustrated descriptions of the adult male, pupa and fourth instar larva, as well as DNA barcoding results of Chaetocladius (Chaetocladius) elisabethae sp. nov. in comparison with closely related species of Chaetocladius s.

Morphology and distribution of pelagic ostracods of the genus Boroecia (Ostracoda: Halocyprididae) in the Central Arctic.

Morphologically similar Boroecia borealis and B. maxima are redescribed from the Central Arctic. Their morphological differences are minor but well defined.