A study dealt cytologically with spermatogenetic chromosome cycle and salivary gland cells clear up some biological peculiarities of Thecodiplosis japonensis, Cecidomyiidae ; Diptera, which is noxious insect to pine trees, especially Pinus densiflora....
A study dealt cytologically with spermatogenetic chromosome cycle and salivary gland cells clear up some biological peculiarities of Thecodiplosis japonensis, Cecidomyiidae ; Diptera, which is noxious insect to pine trees, especially Pinus densiflora. the somatic nucleus of both males and females contain eight chromosomes, while in male germ-line cells, two different polyploids ; hexaploidy and decapoidy, were found it is that based on the haploid of four chromosomes. In this gall midges, among 24 chromosomes in each germ-line cell, eight are S-chromosomes and 16 of E-chromosomes. Therefore, 24 chromosomes would be spermatogonial proper figures, 40 would be the endomitotic remainder just after first meiotic division. consequently, only one secondary spermatocyte which has the chromosomes originated from father's haploid made two spermatids. Thedetails of the results are discussed in the text.