Cytological Studies in Hymenoptera

Part II: Cytology of parthenogenesis in the carpenter-bee, Xylocopa fenesterata Fabre

Abstract

X. fenesterata has been found to be arrhenotokously parthenogenetic, and the haploid male/diploid female chromosomal relationship is 16/32. The male meiosis I is abortive but a cytoplasmic bud, usually considered as the vestigial secondary spermatocyte, is not produced. The second spermatocyte division is also anomalous as only one functional spermatid is formed.