Karyotypes for Physocyclus mexicanus and Holocnemus pluchei and giemsa-stained meiosis I spermatocytes.

A. Haploid karyotype for Physocyclus mexicanus taken from fixed, giemsa-stained metaphase II spermatocyte. B. Haploid karyotype for Holocnemus pluchei taken from a fixed, giemsa-stained metaphase II spermatocyte (chromosomes 1–13 and Y chromosome) and a fixed, giemsa-stained anaphase I spermatocyte (X chromosome). C. Giemsa-stained metaphase I spermatocyte of Physocyclus mexicanus. X chromosome indicated by arrow. Bar = 10 µm. D. Giemsa-stained metaphase I spermatocyte of Holocnemus pluchei. X-Y bivalent indicated by arrow. Bar = 10 µm.