Chromosomes of Hersiliidae (A–F) and Oecobiidae (G–L). Hersilia sericea (2n♂ = 35, X1X2X30) A mitotic metaphase B early metaphase I, X1X2X3 shows slightly positive heteropycnosis C metaphase II, note positively heteropycnotic X1X2X3. Neotama corticola (2n♂ = 33, X1X2X30) D early diakinesis, sex chromosomes E half of anaphase I with despiralised sex chromosomes F quarter of anaphase II with despiralised sex chromosomes. Oecobius putus (2n♂ = 25, X1X2X30) G mitotic metaphase H half of anaphase I with positively heteropycnotic sex chromosomes. O. navus (2n♂ = 19, X0) I mitotic metaphase J pachytene with compact X K diakinesis X univalent shows positive heteropycnosis L metaphase I with already isopycnotic X. Arrowheads indicate sex chromosomes. Scale bars: 5 μm.