The Thick-clawed Crayfish, Astacus pachypus (Crustacea, Decapoda, Astacidae), in Ukraine: Karyotype, Allozymes and Morphological Parameters

Mezhzherin, S. V., Kostyuk, V. S., Garbar, A. V., Zhalai, E. I., Kutishchev, P. S.



Allozymic, karyological and morphological analyzes confirmed the presence of the Thick-clawed crayfish, Astacus pachypus (Rathke, 1837), in Ukraine. This rare species in Ukraine is found only in two small adjacent localities restricted to the Lower Dnieper. It is characterized by a unique set of chromosomes (2n = 116) and a distinct pool of allozymes, allowing, together with morphological features, to clearly distinguish it from the other three species of the Ukrainian fauna.