title: Karyotype variation in the South American aphid genus Neuquenaphis (Hemiptera, Aphididae, Neuquenaphidinae).
abstract: The endemic South American aphid genus Neuquenaphis (Hemiptera, Aphididae, Neuquenaphidinae) forms an important component of the phytophagous insect fauna associated with southern beeches, Nothofagus (Nothofagaceae), but has not previously been studied cytologically. As part of ongoing studies of the taxonomy, evolution and host relationships of this genus, the karyotypes of 12 species are described and illustrated. Species are mostly distinguishable by differences in number and/or relative lengths of chromosomes, with 2n (female) numbers ranging from 6 to 16. The taxonomic and evolutionary significance of the karyotype variation in this group are discussed.
authors.affiliation: Department of Entomology, The Natural History Museum, London, UK.
authors.forename: Roger L
authors.initials: RL
authors.lastname: Blackman
authors.forename: Paul A
authors.initials: PA
authors.lastname: Brown
authors.forename: Claudio C
authors.initials: CC
authors.lastname: Ramírez
authors.forename: Hermann M
authors.initials: HM
authors.lastname: Niemeyer
mesh_terms: D000818:Animals; D001042:Aphids / Q000235:genetics*; D002875:Chromosomes / Q000235:genetics*; D004171:Diploidy; D019143:Evolution, Molecular; D005260:Female; D005819:Genetic Markers; D014644:Genetic Variation / Q000235:genetics*; D007621:Karyotyping; D008677:Metaphase; D008938:Mitosis; D013045:Species Specificity
chemical_list: D005819:Genetic Markers