Cytogenetic heterogeneity in common haplogyne spiders from Argentina (Arachnida, Araneae)

RODRÍGUEZ-GIL SERGIO GUSTAVO; MOLA LILIANA MARÍA; PAPESCHI ALBA GRACIELA; SCIOSCIA CRISTINA LUISA

JOURNAL OF ARACHNOLOGY

Allen Press

Lugar: Kansas, USA; Año: 2002 vol. 30 p. 47 - 56

0161-8202

ABSTRACT. The spermatogenesis of four species of haplogyne spiders from Argentina is analyzed. Dysdera crocota (Dysderidae) (n =5 + X0) has holokinetic chromosomes, achiasmatic male meiosis and a post-reductional division of the sex chromosome. Ariadna boesenbergii (Segestriidae) (n =4 + X0) also possesses holokinetic chromosomes, but meiosis is chiasmatic and the X chromosome divides prereductionally. Kukulcania hibernalis (Filistatidae) (n =11 + X1X20) and Scytodes globula (Scytodidae) (n = 6 + X0) have metacentric and submetacentric chromosomes, chiasmatic meiosis and the sex chromosomes divide pre-reductionally. Kukulcania hibernalis possesses a bimodal karyotype and a particular chromatin coiling during prophase I, while Scytodes globula has striking proximal localization of chiasmata. These results show that Haplogynae present high cytogenetic heterogeneity: species with holokinetic chromosomes as well as species with monocentric chromosomes (metacentric and submetacentric), and species with low diploid numbers, achiasmatic meiosis and proximal chiasma localization. The spermatogenesis of four species of haplogyne spiders from Argentina is analyzed. Dysdera crocota (Dysderidae) (n =5 + X0) has holokinetic chromosomes, achiasmatic male meiosis and a post-reductional division of the sex chromosome. Ariadna boesenbergii (Segestriidae) (n =4 + X0) also possesses holokinetic chromosomes, but meiosis is chiasmatic and the X chromosome divides prereductionally. Kukulcania hibernalis (Filistatidae) (n =11 + X1X20) and Scytodes globula (Scytodidae) (n = 6 + X0) have metacentric and submetacentric chromosomes, chiasmatic meiosis and the sex chromosomes divide pre-reductionally. Kukulcania hibernalis possesses a bimodal karyotype and a particular chromatin coiling during prophase I, while Scytodes globula has striking proximal localization of chiasmata. These results show that Haplogynae present high cytogenetic heterogeneity: species with holokinetic chromosomes as well as species with monocentric chromosomes (metacentric and submetacentric), and species with low diploid numbers, achiasmatic meiosis and proximal chiasma localization.