Abstract
The British species of Oncopsis fall into two groups with respect to male karyotype. Four species—O. avallanae, O. carpini and O. subangulata, together with an undescribed new species close to carpini—consistently show ten autosome pairs and a single X-chromosome (2n=10AII+XO). In O. tristis too the XO state predominates but single neo-sex chromosome variants with nine and eight autosome pairs respectively have also been found. The two remaining species-O. alni and O. flavicollis—both regularly include derived neo-XY states involving the incorporation of autosomal material onto the X(2n=9AII+XY). The single population of O. alni studied was entirely neo-XY but the situation in O. flavicollis proved more complex. Montane populations which occur on Betula pubescens are XO-monomorphic whereas populations in lowland woodlands are polymorphic, including both XO and neo-XY types. In such situations the XO forms are found predominantly on B. pubescens whereas the XY morphs predominate on a second species of birch, B. pendula, which is absent from montane woodlands. In all three species where the neo-XY state is present, different autosomes have been involved in the fusion process.
Similar content being viewed by others
References
Claridge, M. F., Howse, P. E.: Songs of some British Oncopsis species (Hemiptera:Cicadellidae). Proc. roy. ent. Soc. Lond. (A) 43, 57–61 (1968)
Claridge, M. F., Reynolds, W. J.: Host plant specificity, oviposition behaviour and egg parasitism in some woodland leafhoppers of the genus Oncopsis (Hemiptera Homoptera: Cicadellidae). Trans. roy. ent. Soc. Lond. 124, 149–166 (1972)
Claridge, M. F., Reynolds, W. J.: Male courtship songs and sibling species in the Oncopsis flavicollis species group (Hemiptera:Cicadellidae). J. Ent. (B) 42, 29–39 (1973)
Halkka, O.: Chromosome studies on the Hemiptera Homoptera Auchenorrhyncha. Ann. Acad. Sci. Fenn. AIV Biol. 43, 1–71 (1959)
Halkka, O.: Chromosomal evolution in the Cicadellidae. Hereditas (Lund) 46, 581–591 (1960)
Halkka, O.: Recombination in six homopterous families. Evolution (Lawrence, Kans.) 18, 81–99 (1964)
John, B., Lewis, K. R.: The meiotic system. Protoplasmatologia VI/F/1. Wien: Springer 1965
La Chance, L. E., Degrugillier, M., Leverich, A. P.: Cytogenetics of inherited partial sterility in three generations of the large milkweed hug as related to holokinetic chromosomes. Chromosoma (Berl.) 29, 20–41 (1970)
Le Quesne, W. J.: Studies in the British species of Oncopsis Burmeister (Hem., Cicadellidae), including a discussion on whether O. subangulata Sahlberg is a valid species. Entomologist's Month. Mag. 97, 164–170 (1961)
Wagner, W.: Die deutschen Arten der Gattung Oncopsis Burmeister. Verh. Ver. naturw. Heimatf. Hamburg 30, 1–25 (1949)
Walters, S. M.: Betula. In: Flora europaea I. Lycopodiaceae to Plantanaceae (T. G. Tuttin, V. H. Heywood, N. A. Burges, D. H. Valentine, S. M. Walters and D. A. Webb, eds.), 1964
Whitten, M. J., Taylor, W. C.: Chromosomal polymorphism in an Australian leaf-hopper (Homoptera:Cicadellidae). Chromosoma (Berl.) 26, 1–6 (1969)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
John, B., Claridge, M.F. Chromosome variation in British populations of Oncopsis (Hemiptera:Cicadellidae) . Chromosoma 46, 77–89 (1974). https://doi.org/10.1007/BF00332340
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00332340