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On the karyotypes of the British high chromosome number Nabidae (Insecta: Heteroptera)

Angus R.B., McCartney S., Thompson L.

Abstract. Chromosome data are given for Himacerus apterus (Fabricius, 1798) – 2n= 36+XY, H. mirmicoides (O. Costa, 1834) – 2n=32+XY and Stalia major (A. Costa, 1841) – 2n= 30+XY. The X chromosome of the two Himacerus species is about four times the length of the longest autosomes. In H. apterus the Y chromosome is also large, about half the length of the X chromosome, but in H. mirmicoides it is small, about a fifth the length of the X chromosome. In Stalia major the X chromosome appears similar in length of the largest autosomes, but the Y chromosome is small, as in H. mirmicoides. The karyotype of Stalia boops (Schiødte, 1870) remains unknown.