© Comparative Cytogenetics, 2009 . Vol. 3, No. 1, P. 33-41. ISSN 1993-0771 (Print), ISSN 1993-078X (Online) Chromosome numbers in eight species of Palaearctic Psocoptera (Insecta) N.V. Golub1, S. Nokkala2 1Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, St. Pe- tersburg 199034, Russia. 2Laboratory of Genetics, Department of Biology, University of Turku, FIN-20014, Turku, Finland. E-mails:
[email protected], 2seppo.nokkala@utu.fi Abstract. Karyotypes of eight Psocoptera species are reported for the fi rst time. In Va- lenzuela oyamai (Enderlein, 1906) (Caeciliusidae), Peripsocus golubae Lienhard, 2006 (Peripsocidae), Trichopsocus dalii (McLachlan, 1867) (Trichopsocidae), Hemineura dispar Tetens, 1891 (Elipsocidae), and Amphigerontia contaminata (Stephens, 1836) (Psocidae) 2n = 16 + XX/X0. In Elipsocus moebiusi Tetens, 1891 (Elipsocidae) 2n = 12 + XX/X0. Neopsocopsis hitricornis (Reuter, 1893) (Psocidae) has 2n = 14 + XX/ X0, and Kolbia quisquiliarum Bertkau, 1883 (Amphipsocidae) has 2n = 14 + neo-XY/ XX. In addition, three seminal follicles per testis have been established in V. oyamai, H. dispar, A. contaminata, and N. hitricornis and one follicle in P. golubae and T. dalii. All the data available on psocopteran karyotypes are tabulated and shortly reviewed. Key words: Psocoptera, karyotype, chromosome number, chromosomal mechanism of sex determination. INTRODUCTION coptera. The majority of species (72) belong Psocoptera are a hemimetabolous insect to the most advanced suborder Psocomorpha. order, belonging with the orders Phithiraptera, The present study reports data on the Thysanoptera, Heteroptera, and Homoptera to karyotypes of 8 species from 8 genera and 6 the Cohort Paraneoptera. Within Psocoptera families of Psocomorpha. The data on Neop- three suborders, Trogiomorpha, Troctomor- socopsis Badonnel, 1936, Hemineura Tetens, pha, and Psocomorpha, have been accepted 1891 and Kolbia Bertkau, 1882 are the fi rst (Lienhard, 1998; Lienhard, Smithers, 2002).