KARYOTYPES AND MORPHOLOGICAL VARIABILITY OF CRAYFISH PONTASTACUS LEPTODACTYLUS AND P. ANGULOSUS (MALACOSTRACA, DECAPODA)В. С.КостюкauthorО. В.ГарбарauthorС. В.МежжерінauthorThe existence on the territory of Ukraine of two sympatric widespread species definitely different by their chromosome number was proved based on the meiotic chromosome preparations. Besides the nominal species Pontastacus leptodactylus (Dana, 1852) with modal haploid chromosome number n = 93 we prove the existence of P. angulosus (Rathke, 1837) with n = 88.QL Zoology2013Институт зоологии им. И.И. Шмальгаузена НАН УкраиныArticle