, Volume 46, Issue 4, pp 445–456 | Cite as

Cytological studies of the two-spotted spider mite Tetranychus urticae Koch (Tetranychidae, trombidiformes). I: Meiosis in eggs

  • C. C. M. Feiertag-Koppen

Meiosis in eggs of Tetranychus urticae Koch is described. The two maturation divisions result in (a) a haploid female pronucleus consisting of three karyomeres; — (b) a divided first polar body in which the chromosomes change into karyomeres; — (c) a second polar body, entering a new mitosis which is blocked in metaphase. Irradiation of adult females produced chromosome fragments in the meiotic divisions. The fragments behave as intact chromosomes which proves that during meiosis a diffuse kinetochore is present. The meiotic divisions show the cytologically characteristic features of an inverted meiosis. The presence of such a meiosis is corroborated by observations on eggs heterozygous for chromosome mutations. In both maturation divisions the chromosomes are orientated equatorially. It is suggested that the equatorial orientation is brought about by chiasmata having terminalized to both ends of the dyads. It is argued that in organisms with holokinetic chromosomes during meiosis an axial orientation of the bivalents does not necessarily imply a normal meiosis but can also imply an inverted meiosis.


Characteristic Feature Adult Female Polar Body Meiotic Division Axial Orientation 
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  1. BattagliaE. & J. W.Boyes (1955). Post-reductional meiosis: its mechanism and causes. Caryologia 8: 87–134.Google Scholar
  2. ComingsD. E. & T. A.Okada (1972). Holocentric chromosomes in Oncopeltus: Kinetochore plates are present in mitosis but absent in meiosis. Chromosoma 37: 177–192.Google Scholar
  3. CooperK. W. (1939). The nucear cytology of the grass mite Pediculopsis graminum (Reut.), with special reference to karyomeriokinesis. Chromosoma 1: 51–103.Google Scholar
  4. CooperR. S. (1972). Experimental demonstration of holokinetic chromosomes, and of differential “Radiosensitivity” during oogenesis, in the grass mite, Siteroptes graminum (Reuter). J. exp. Zool. 182: 69–94.Google Scholar
  5. DuttM. K. (1968). Increase of the amount of DNA-Feulgen in mammalian tissue by Schiff reagents at less acid pH. Experientia 24: 615–616.Google Scholar
  6. HelleW. (1962). Genetics of resistance to organophosphorous compounds and its relation to diapause in Tetranychus urticae Koch (Acari). Tijdschr. Plziekten 68: 155–195.Google Scholar
  7. Hughes-SchraderS. (1948). Cytology of coccids (Coccoïdea-Homoptera). Adv. Genet. 12: 127–203.Google Scholar
  8. Hughes-SchraderS. & F.Schrader (1961). The kinetochore of the Hemiptera. Chromosoma 12: 327–350.Google Scholar
  9. KeylH. G. (1957). Zur Karyologie der Hydrachnellen (Acarina). Chromosoma 8: 719–729.Google Scholar
  10. MurakamiA. & H. T.Imai (1974). Cytological evidence for holocentric chromosomes of the silkworms, Bombyx mori and B. mandarina (Bombycidae, Lepidoptera). Chromosoma 47: 167–178.Google Scholar
  11. PätauK. (1936). Cytologische Untersuchungen an der haploid-parthenogenetischen Milbe Pediculoides ventricosus. Zool. Jb., Abt. Physiol. 56: 277–322.Google Scholar
  12. PijnackerL. P. & M. A.Ferwerda (1972). Diffuse kinetochores in the chromosomes of the arrhenotokous spider mite Tetranychus urticae Koch. Experientia 28: 354.Google Scholar
  13. SchraderF. (1923). Haploidie bei einer Spinnmilbe. Arch. mikrosk. Anat. Entw. Mech. 97: 610–622.Google Scholar
  14. UeshimaN. (1963). Chromosome behavior of the Cimex Pilosellus complex (Chimicidae: Hemiptera). Chromosoma 14: 511–521.Google Scholar
  15. WittmanW. (1965). Acelo-iron-haematoxylin-chloral hydrate for chromosome staining. Stain Techn. 40: 161.Google Scholar
  16. WolfeS. L. & B.John (1965). The organization and ultrastructure of male meiotic chromosomes in Oncopeltus fasciatus. Chromosoma 17: 85–103.Google Scholar

Copyright information

© Martinus Nijhoff 1976

Authors and Affiliations

  • C. C. M. Feiertag-Koppen
    • 1
  1. 1.Department of Genetics, Biological CentreUniversity of GroningenHaren (Gn)The Netherlands

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