Chromosomes of Ctenidae (A–B), Oxyopidae (C–E), Sparassidae (F–J) and Thomisidae (K–P). Ctenus cf. pulchriventris (2n♂ = 28, X1X20) A pachytene, X1X2 associate on the periphery of plate B diakinesis. Peucetia striata (2n♂ = 28, X1X20) C mitotic metaphase D metaphase I E metaphase II, sex chromosomes isopycnotic. Olios sp. (2n♂ = 42, X1X20) F mitotic metaphase G pachytene H late diakinesis I metaphase II J Diakinesis of Sparassinae sp. cf. Olios (2n♂ = 42, X1X20). Borboropactus sp. (2n♂ = 28, X1X20) K mitotic metaphase L metaphase I M half of metaphase II without sex chromosomes. Xysticus sp. (2n♂ = 23, X0) N mitotic metaphase O metaphase I, note early segregation of one bivalent P prometaphase II. Arrowheads indicate sex chromosomes. Scale bars: 5 μm.