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Karyotype analysis of two species of Oribatida (Acari)

Zhang, P.-J. ; Fu, R.-S. and Wang, Y.-H.

2004 - Volume: 44 Issue: 3-4 pages: 231-234


Acari Oribatida karyotype B-chromosome


The karyotypes of two species of Oribatida, Brasilobates spinosus Fujita (1989) and Galumna longoporosa Choi, (1986), were studied in oocyte. The result showed that B. spinosus has 16 chromosomes on mitosis metaphase plate (male: 2n=16), and that its karyotype was 2n =16 (2m + 12st + It + X), N. F =18. A B chromosome was found on mitosis metaphase; G. longoporosa has 19 chromosomes on mitosis plate (2n=19), and its karyotype is 2n=19 (2sm + 16st + X), N. F =21. The two species of Oribatida have the same sex determining mechanism (XX: XO).

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2004 Zhang, P.-J.; Fu, R.-S. and Wang, Y.-H.
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