Study on the Chromosomal C-banding Karyotype of Two Species of Filchnerella from China(Acridoidea:Pamphagidae)

The chromosomal C-banding karyotype is a valuable index to identify species,compare and deduce phylogenetic relationship among taxa.The location,size and number of C-banding and the content of heterochromatin could reflect the similarities and differences of different genera,species and under-species taxa.The chromosomal C-banding karyotypes in the spermatogenesis of Filchnerella beicki and Filchnerella amplivertica from China were investigated.The diploid numbers of the 2 species of Filchnerella are 19(2n♂).All chromosomes are acrocentric and possess 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 two species.These differences could be used to distinguish species.