Chromosomal fusion and meiotic behaviour in Delena cancerides (Araneae: Sparassidae). I. Chromosome pairing and X-chromosome segregation

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Abstract
Surface spreading of meiotic material in Delena cancerides indicates that pairing initiation among metacentric chromosomes with monobrachial homology differs from that of telocentric forms and free metacentric bivalents and results in a star-shaped structure at pachytene. Distance cosegregation of the three X chromosomes in ancestral, telocentric forms is prefaced by a centric association early in prophase I. This centric association of the X chromosomes is conserved in metacentric races despite the presence of an X-autosome fusion.Key words: synaptonemal complex, translocation heterozygote, X chromosome, spider.

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