New Species and First Record of Dannella Edmunds 1959 (Ephemeroptera: Ephemerellidae) from the Eastern Palaearctic.

A new species, Dannella daurica sp. nov. is described from the Far East of Russia, based on larvae.

Environmental protection measures in mineral resource development: case study of a gold-bearing deposit in the Russian Far East.

In the Russian mining industry, the recent social and economic processes inevitably affect environmental safety and the social security of all those affected by mining. Thus, this study aimed to evaluate the technogenic impacts of a mining company on the environment. Measures were developed and implemented to ensure ecological safety and social security during a mineral resource development project in the southern part of the Russian Far East.

Baetis majus sp. nov., new species of mayfly (Ephemeroptera: Baetidae) from Far East of Russia.

A new species, Baetis majus Tiunova sp. nov., is described and illustrated based on larvae and reared adults discovered in the Russian Far East.

Baetis (Rhodobaetis) molecularis sp. nov., a new mayfly species (Ephemeroptera: Baetidae) from the Russian Far East.

A new species Baetis (Rhodobaetis) molecularis sp. nov. is described and illustrated based on larvae and reared adults from the Far East of Russia.

Description of the larva of Cinygmula levanidovi Tshernova amp; Belov, 1982(Ephemeroptera, Heptageniidae) with redescription of the male adult from the Russian Far East.

The larvae, male and female imagines, and eggs of Cinygmula levanidovi Tshernova Belov 1982 are described based on reared specimens from the Russian Far East. The larvae, female imago and eggs are described and illustrated for the first time. The larva of C.

Baetis pentaphyllus sp. nov., a new species of mayfly (Ephemeroptera: Baetidae) from the Russian Far East.

A new species, Baetis pentaphyllus sp. nov., is described on the basis of larvae from the Far East of Russia (type locality Bolshoi Garmakan River).

A new species of Lestage, 1917 (Ephemeroptera: Leptophlebiidae) and a re-description of adults for Imanishi, 1937 with the first description of the larva, from the Russian Far East.

Male, female imagoes and eggs of Paraleptophlebia kunashirica sp. nov. and the larva, male and female imagoes of Paraleptophlebia westoni are described based on material from the Russian Far East.

New species of Eaton, 1885 from the Russian Far East with notes on Ulmer 1927 (Ephemeroptera: Ameletidae).

The male imagoes, larvae, and eggs of Ameletus allengaensis sp. nov. and Ameletus sirotskii sp.

Redescription of Paraleptophlebia falcula Traver 1934 with notes on status and composition of Paraleptophlebia Lestage 1917 and Neoleptophlebia Kluge 1997 (Ephemeroptera: Leptophlebiidae).

The taxon Paraleptophlebia Lestage 1917 is accepted here in generic rank, so rank of Neoleptophlebia Kluge 1997 is also raised from subgenus to genus, and the following new combinations are proposed: Neoleptophlebia adoptiva (McDunnough 1929) comb. n., N.

A new species, Procloeon monilistylus sp. n. (Ephemeroptera, Baetidae), from the Russian Far East.

A new, two-winged species Procloeon monilistylus sp. n. is described from the Russian Far East based on male and female imagoes reared from larvae.

New species of Cinygmula McDunnough, 1933 and larval description of Cinygmula irina Tshernova & Belov, 1982 from the Russian Far East (Ephemeroptera: Heptageniidae).

Here, we describe Cinygmula tetramera, sp. nov. (Ephemeroptera: Heptageniidae), which has male imaginal forceps with three distal segments, based on male & female imagos reared from larvae.

New species of Ameletus Eaton, 1885 and redescription of Ameletus longulus Sinichenkova, 1981 from the Russian Far East (Ephemeroptera: Ameletidae).

Ameletus khasanensis sp. nov. is described and Ameletus longulus Sinichenkova, 1981 is revalidated and redescribed based on material from the Russian Far East.