The variability of the chromosome numbers in Psocomorpha (Insecta, Psocoptera)

Abstract

Karyotypes of 10 species of Psocoptera of 8 genera and 5 families of the advanced suborder Psocomorpha are reported for the first time. In Stenopsocus aphidiformis End. 2n=23, 24 (22A + X0/XX); in Lachesilla pedic-ularia L., L. tanaidana Roesler, Ectopsocus briggsi McLachl., Elipsocus pumilis (Hagen), Amphigerontia bifasciata (Latr.), Sigmatoneura kolbei End., and Trichadenotecnum sexpunctatum L. 2n=17,18 (16A + X0/XX); in Amphigeron-tia jezoensis Okam. 2n=15, 16 (14A + X0/XX), and in Loensia variegata (Latr.) 2n=13, 14 (12A + X0/XX). The karyotype variability in suborder is estimated. The pathways of the karyotype evolution in Psocomorpha are discussed.

Key words:

• Insectac
• Psocoptera
• chromosome number
• karyotype variability