22Although knowledge of Arctic seas has increased tremendously in the past decade, benthic 23 diversity was investigated at regional scales only, and no attempt had been made to examine it 24 across the entire Arctic. We present a first pan-Arctic account of the species diversity of the

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The paper analyzes published and original data on the current distribution of alien species of mala costracan crustaceans including representatives from the orders Amphipoda, Mysidacea, Isopoda, Cumacea, and Decapoda in the Gulf of Finland (eastern part of the Baltic Sea). Thus far, 12 alien species of allochthonous origin have been recorded in this area. Also, seven species of malacostracans are known as actively spreading species in neighboring regions and therefore as potential invaders to the Gulf of Finland. The invasion history of the alien species and possible vector of their expansion from the original areas to the study area are discussed.

A biogeographical analysis of the North Pacific temperate waters is made on the basis of the distribution of 88 species of Mysidacea (Crustacea) and 111 species of Anomura (Crustacea: Decapoda: Reptantia) inhabiting depths from 0 to 1000-12000 m. At depths from 0 to 180-200 m and from 180-200 to 1000-1200 m, division by mysid fauna is made separately; division according to anomurans is unified. Original schemes of faunistic zonation of the North Pacific are given. The influence of abiotic factors, primarily temperature, on the formation of distribution ranges of Pacific boreal species is examined.

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