Abstract
The karyotype and the course of meiosis in six species of araneomorph spiders of the families Lycosidae and Gnaphosidae are analysed, based on material from Israel, Turkey and the Czech Republic. The number of diploid chromosomes (2n) and the sex-determining system of males were determined as follows: Pardosa alacris (C. L. Koch, 1833) and Pardosa saltans (Töpfer-Hofman, 2000) (Lycosidae) 2n=28 (26+X1X2), Callilepis cretica (Roewer, 1928), Drassodes pubescens (Thorell, 1856), Drassylus pumilus (C. L. Koch, 1839) and Zelotes strandi (Nosek, 1905) (Gnaphosidae) 2n=22 (20+X1X2). Pardosa alacris and P. saltans have 13 autosomal bivalents and two univalent sex chromosomes at prophase and metaphase of the first meiotic division. In contrast to this, all gnaphosids have 10 autosomal bivalents and two sex chromosomes during these meiotic stages.
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