The male adults of four species of the Chinese Panorpidae in Mecoptera were cytogenetically studied using conventional squashing procedures. The results show that their sex-chromosome system belongs to the XO type, with n = 19 + X(O) in Panorpa emarginata Cheng,1949 and Panorpa dubia Chou & Wang, 1981, n = 23 + X(O) in Panorpa sp., and n = 20 + X(O)in Neopanorpa lui Chou & Ran, 1981. X chromosomes of these species usually appear dot-shaped in late prophase I and are easily differentiated from autosomal bivalents. Meiosis inthese Panorpidae lacks typical diplotene and diakinesis. In late prophase I, pairs of homologous chromosomes remain parallel in a line and show no evidence of crossing-over. Someof them even appear as a single unit because of extremely intimate association, all with a tendency of increasing condensation. The evolutionary significance of their chromosomaldifferences and the achiasmatic meiosis of Panorpidae are briefly discussed. © Bo Xu et al.
CITATION STYLE
Xu, B., Li, Y., & Hua, B. (2013). A chromosomal investigation of four species of chinese panorpidae (Insecta, Mecoptera). Comparative Cytogenetics, 7(3), 229–239. https://doi.org/10.3897/CompCytogen.v7i3.5500
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