, Volume 38, Issue 1, pp 43–53 | Cite as

Karyotypes and sex-determination in spider mites (Tetranychidae)

  • W. Helle
  • H. R. Bolland


The chromosomes of 13 species of spider mites (Tetranychidae) are determined using the aceto-orcein squash technique in order to establish the haplo-diploid sex-determination. 12 species showed the existence of haploid and diploid eggs:Neotetranychus rubi (Trägårdh) with 7 and 14 chromosomes;Eurytetranychus buxi (Garman) with 5 and 10;Bryobia sarothamni (Geijskes),Eotetranychus tiliarium (Joh. Hermann) andE. carpini (Oudemans) with 4 and 8;Panonychus ulmi (Koch),Schizotetranychus schizopus (Zacher),Oligonychus ununguis (Jacobi).Tetranychus hydrangeae Pritch. & Baker, T.pacificus McGregor,T. urticae Koch andT. cinnabarinus (Boisduval) with 3 and 6 chromosomes.

The progeny of virgin females in 7 different species consisted of eggs with the haploid complement. One species was shown to be thelytokous, viz.Tetranycopsis horridus (Canestrini & Franzago), having a diploid number of 4 chromosomes. Some eggs of an inbred line ofT. urticae showed a patchwork quilt of odd polyploidy in embryonic tissue.


Inbred Line Spider Mite Virgin Female Embryonic Tissue Diploid Number 
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Copyright information

© Martinus Nijhoff 1967

Authors and Affiliations

  • W. Helle
    • 1
  • H. R. Bolland
    • 1
  1. 1.Laboratory of Applied EntomologyUniversity of AmsterdamAmsterdam

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