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Wysoki, M., Division of Entomology, The Volcani Institute of Agricultural Research, Bet Dagan, Israel
Swirski, E., Division of Entomology, The Volcani Institute of Agricultural Research, Bet Dagan, Israel
The chromosomal picture was studied on early cleayage divisiona of 10 phytoseiid mites, using the aceto-orcein smear technique. Eggs of 9 species have either a haploid (4) or a diploid (8) number of chromosomes:Amblyseius rubini Swirski & Amitai, A. swirskii Athias, A. hibisci Chant, A. ohilenensis (Dosse), A. largoensis (Muma), Typhlodromus athiasae Porath and Swirski T. rhenanus (Oud.) sensu latiore, Phytoseiulus persimilis Athias, and I phiseius degeneraus (Berlese). Typhlodromus oceidentalis Nesbitt has 3 and 6 chromosomes. In sections and smears of post embryonic stages belonging to mites representative of the four genera, a haploid number was found in males, whereas in females somatic cells contained 2n and ovaries n as well as 2n. Thus it is shown that sex is determined by the haplo-diploid (arrhenotokous) mechanism. Males differ from females in the structure of the interphase nuclei belonging to the central nervous system. © 1968 Martinus Nijhoff.
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Karyotypes and sex determination of ten species of phytoseiid mites (acarina: Mesostigmata)
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Wysoki, M., Division of Entomology, The Volcani Institute of Agricultural Research, Bet Dagan, Israel
Swirski, E., Division of Entomology, The Volcani Institute of Agricultural Research, Bet Dagan, Israel
Karyotypes and sex determination of ten species of phytoseiid mites (acarina: Mesostigmata)
The chromosomal picture was studied on early cleayage divisiona of 10 phytoseiid mites, using the aceto-orcein smear technique. Eggs of 9 species have either a haploid (4) or a diploid (8) number of chromosomes:Amblyseius rubini Swirski & Amitai, A. swirskii Athias, A. hibisci Chant, A. ohilenensis (Dosse), A. largoensis (Muma), Typhlodromus athiasae Porath and Swirski T. rhenanus (Oud.) sensu latiore, Phytoseiulus persimilis Athias, and I phiseius degeneraus (Berlese). Typhlodromus oceidentalis Nesbitt has 3 and 6 chromosomes. In sections and smears of post embryonic stages belonging to mites representative of the four genera, a haploid number was found in males, whereas in females somatic cells contained 2n and ovaries n as well as 2n. Thus it is shown that sex is determined by the haplo-diploid (arrhenotokous) mechanism. Males differ from females in the structure of the interphase nuclei belonging to the central nervous system. © 1968 Martinus Nijhoff.
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