Abstract
Karyotypes and meiosis of five spider species belonging to the families Gnaphosidae, Miturgidae and Philodromidae were studied using standard Giemsa staining. The male diploid chromosome numbers (2n) and the sex chromosome systems were as follows: Drassodes lutescens: 2n = 21 (X0), Micaria albovittata: 2n = 22 (X1X20), Cheiracanthium mildei: 2n = 26 (X1X20), Cheiracanthium pennyi: 2n = 26 (X1X20) and Philodromus lividus: 2n = 28 (X1X20). Chromosomes of all specimens were telocentric. During the first meiotic division, 10, 10, 12, 12 and 13 autosomal bivalents, respectively, and two sex chromosomes were obtained, with the exception of Drassodes lutescens, which had a different type of sex chromosome system (♂X0/♀XX). During the second meiotic division, two types of nuclei were determined, with or without the sex chromosomes. These karyological data are useful for a better understanding of the chromosomal evolution of araneomorph spiders.
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