The chromosomal C-banding karyotypes of two pamphagid species from China.

The chromosomal C-banding karyotype is useful for species identification and phylogenetic analyses.The location,size and number of C-bandings and the content of heterochromatin reflect the relationships between different genera,species and even subspecies.The chromosomal C-banding karyotypes in the spermatogenesis of Pseudotmethis rubimarginis Li and Beybienkia songorica Tzyplenkov(Orthoptera Pamphagidae) from China were investigated.The diploid numbers of the 2 species of Pamphagidae are 19(2n♂).All chromosomes are acrocentric with paracentromeric C-bands,and the mechanism of sex determination are XO(♂).There are some differences in the relative length of chromosomes and in the size,location and degree of dyeing of C-bands between the 2 species.This may be used to distinguish the 2 species.