Timofeev S.F. 2005. [Morphometric differentiation in euphausiid, Thysanoessa raschii (Crustacea, Euphausiacea), from the Barents and Laptev Seas] // Invertebrate Zoology. Vol.2. No.1: 61–66 [in Russian, with English summary].

Murmansk Marine Biological Institute, Kola Science Center, Russian Academy of Sciences, Vladimirskaya St., 17, Murmansk, 183010, Russia.

ABSTRACT: We examined the morphometric differentiation in Arctic krill, Thysanoessa raschii (M. Sars, 1846), collected in the Barents and Laptev Seas. At the same total body length, the lengths of the carapace, abdomen and telson were different in euphausiids from the two populations. It is suggested that a shorter abdomen length and longer carapace and telson in the Laptev Sea versus the Barents Sea specimens may be a reaction to unfavourable conditions, especially food scarcity.

KEY WORDS: euphausiid crustaceans, Thysanoessa raschii, allometric growth.

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