Dataset originated from field surveys carried out from May to October 2001, to assess the seasonal variations in the population structure of four species of intertidal harpacticoids (Paraleptastacus kliei, Huntemannia jadensis, Heterolaophonte minuta, and Stenhelia palustris) at three sites in the middle intertidal zone of Chernorechenskaya Bay (White Sea) with different sediment compositions.

Data of harpacticoida from intertidal flat of the Chernaya River estuary, Gulf of Kandalaksha, White Sea in July-August, 2000.

Occasional sampling of Harpacticoida in a silty-sandy intertidal site Gulf of Kandalaksha (White Sea) on June 26, 2007. Sampling: Syringe corer 5.4 cm2

Data originated from a field study on harpacticoida carried out in the Chernaya River estuary of Kandalaksha (White Sea) in July - October 2000. The aim of the study was to assess the colonization patterns of Harpacticoida according to different sediment conditions.

Data derived from study on the composition, ecological groups, and life forms of Harpacticoids of soft littoral grounds from 15 sites off the Karelian coast in Kandalaksha Bay of the White Sea.

Data on Harpacticoida from field survey during a scientific cruise of RV "Akademik" (Institute Oceanology, BAS) in the western part of the Black Sea in September - October 2003.

Field long-term monitoring survey of ecologically intact zone (control) within the human-impacted area at north-western part of the Black Sea.

An annotated check-list is given of Polychaeta species occurring deeper than 2000 m in the seas bordering Europe.

Harpacticoida data from quantitative distribution data of meiobenthos studied at 16 stations in the estuary of the Chernaya River (Kandalaksha Bay, White Sea) in the salinity range from 0 to 20%o.