title: Variability of 18rDNA loci in four lace bug species (Hemiptera, Tingidae) with the same chromosome number.
abstract: Male karyotypes of Elasmotropis testacea (Herrich-Schaeffer, 1835), Tingis cardui (Linnaeus, 1758), Tingis crispata (Herrich-Schaeffer, 1838), and Agramma femorale Thomson, 1871 (Heteroptera, Cimicomorpha, Tingidae) were analyzed using conventional chromosome staining and FISH with 18S rDNA and (TTAGG) n telomeric probes. The FISH technique was applied for the first time in the Tingidae. In spite of the fact that all species showed the same chromosome number (2n = 12 + XY), they have significant differences in the number and position of rDNA loci. FISH with the classical insect (TTAGG) n probe produced no signals on chromosomes suggesting telomeres in lace bugs to be of some other molecular composition. Tingidae share absence of the (TTAGG) n telomeric sequence with all so far studied taxa of the advanced true bug infraorders Cimicomorpha and Pentatomomorpha.
authors.affiliation: Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, St. Petersburg 199034, Russia.
authors.forename: Natalia V
authors.initials: NV
authors.lastname: Golub
authors.affiliation: Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006, Russia.
authors.forename: Viktor B
authors.initials: VB
authors.lastname: Golub
authors.affiliation: Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, St. Petersburg 199034, Russia.
authors.forename: Valentina G
authors.initials: VG
authors.lastname: Kuznetsova
keywords: (TTAGG)n; Cimicomorpha; FISH; Hemiptera; Heteroptera; Karyotype; Tingidae; rDNA; sex chromosomes