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Abstract
Chromosomes of the males of five species of Odontura, belonging to the subgenera Odontura and Odonturella, were ana- lyzed. Intensive evolution of the karyotype was recorded, both in terms of changes in the numbers of chromosomes (from 2n = 31 to 27) and the sex chromosome system (from X0 to neo-XY and X0 to neo-X1X2Y). Karyotype evolution was accompanied by tandem autosome fusions and interspecific autosomal and sex chromosome differentiation involving changes in the locations of nucleolar organizer regions, NORs, which were revealed by silver impregnation and confirmed by FISH using an 18S rDNA probe. O. (Odon- turella) aspericauda is a polytypic species with X0 and neo-X1X2Y sex determination. The latter system is not common in tettigo- niids. It possibly originated by a translocation of a distal segment of the original X chromosome onto a medium sized autosome, resulting in a shortened neo-X1 and a metacentric neo-Y. The remaining autosome homologue became the neo-X2 chromosome. This shift from X0 to neo-X1X2Y is supported by the length of the X chromosome and location of the NOR/rDNA.
Highlights
Bushcrickets (Tettigoniidae Krauss, 1902), constitute a large orthopteran family, which is divided into more than 20 subfamilies (Gorochov, 1995)
Karyotype evolution was accompanied by tandem autosome fusions and interspecific autosomal and sex chromosome differentiation involving changes in the locations of nucleolar organizer regions, nucleolus organizer regions (NORs), which were revealed by silver impregnation and confirmed by fluorescence in situ hybridization (FISH) using an 18S ribosomal 18S DNA (rDNA) probe
The fluorescence in situ hybridization (FISH) technique with ribosomal 18S DNA and telomeric (TTAGG)n DNA probes was performed according to Warchaáowska-ĝliwa et al (2009)
Summary
Bushcrickets (Tettigoniidae Krauss, 1902), constitute a large orthopteran family, which is divided into more than 20 subfamilies (Gorochov, 1995). The katydid (Phaneropterinae Burmeister, 1838) subfamily has more than 2300 species and at least 339 genera, distributed worldwide (Eades et al, 2010). The first systematic study of Phaneropterinae is that of Brunner von Wattenwyl (1878), who is the author of the first revision (Brunner von Wattenwyl, 1891). Since this revision there have been no other comprehensive classifications of this subfamily. Brunner von Wattenwyl (1878) includes the genera of Phaneropterinae with very short forewings in the tribe Odonturini (= Odonturae). Jacobson (1905) distinguished a new tribe within Phaneropterinae, the Barbitistini, for genera with very short forewings, he did not list the genus Odontura Rambur, [1838]. The Barbitistini seem to be monophyletic (Ullrich et al, 2010)
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