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The present article deals with morphological comparison of four species of shrimp larvae, such as Neocrangon communis and Mesocrangon intermedia, Crangon dalli and C. septemspinosa, inhabiting the Okhotsk Sea and north-western part of the Pacific Ocean. Morphological comparison of I-V zoeal stages is discussed. The main morphological differences of the appropriate larval stages are detected. Most features of C. dalli and C. septemspinosa are similar and differ from M. intermedia and N. communis. It is shown that M. intermedia and N. communis more similar species by their origin than it is accepted to think. It is assumed that these two species should be included into one genus-Mesocrangon. The figures of I, III-V zoeal stages are presented.

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This study deals with individual variation in Bradyidius pacificus (Brodsky, 1950) which is one of the most common aetideid copepods of the waters near Kamchatka. Material was collected during spring-summer 2001 in the eastern part of the Sea of Okhotsk. Only data on females of V-VI copepodite stages are presented. Studied was the structure (setation in particular) of individual limbs, rostrum, cephalothorax and abdomen in more than 50 specimens. There were observed 12 variants of the rostrum, up to 5 variants of the structure of individual segments of the antennules, 8 variants of the protopodites of the maxillipedes and up to 3 variants of the structure of the basipodites of the periopods. The rostrum, antennules and maxillipedes were the most variable parts. There were no variability observed of the structure in the maxillules and the antennae. It is shown that the maxillipedes are more variable than it was considered earlier.