Abstract
The process which restores the zygoid number of chromosomes in the thelytokously parthenogenetic stick insectBacillus rossius Rossi, is described. During the first 15 days after oviposition approximately 200 haploid (A+X=18 chromosomes) pre-blastoderm cells develop in the egg-cortex. During the second period of 15 days up to about 2000 blastoderm cells develop in which were found: haploid mitoses, C-mitoses (A+X=18 chromosomes), endomitoses, diploid mitoses (2A+2X=36 chromosomes) and pycnosis. The next 10 days the number of pycnotic nuclei decreases gradually and the blastoderm cells multiply by diploid mitosis only. Thereafter, a diploid germ band is formed either directly or after a diapause. It is concluded that C-mitosis in haploid cells restores the somatic number of chromosomes (automictic parthenogenesis), that a portion of the cells in C-mitosis degenerates and that endomitosis leads to the formation of some polyploid cells only. This development is discussed in relation to the occurrence of geographic parthenogenesis and of impaternate males.
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Pijnacker, L.P. Automictic parthenogenesis in the stick insectBacillus rossius Rossi (Cheleutoptera, phasmidae). Genetica 40, 393–399 (1969). https://doi.org/10.1007/BF01787364
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DOI: https://doi.org/10.1007/BF01787364