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Germ cell differentiation and kinetics were investigated in the coleopteran genus Dermestes. Each species undergoes a fixed number of encysted spermatogonial divisions in which the cell cycle remains constant but the cell size is progressively reduced. Primary spermatocyte development is characterised by considerable growth and the variable meiotic development time is correlated both with DNA C-value and taxonomic grouping within the genus. Spermatogenesis proceeds throughout most of larval and all of pupal and adult life. Cell renewal is from a small number (2-8) of undifferentiated spermatogonia in each testis follicle which 1983 Spermatogenesis in Dermestes 619 probably divide quasi-dichotomously. A male D. maculatus produces >107 sperm during its lifetime.

Germ cell differentiation and kinetics in the testis of Dermestes (Coleoptera).