Eur. J. Entomol. 110 (3): 393-399, 2013 | DOI: 10.14411/eje.2013.052

A karyological study of four European species of Roncus (Pseudoscorpiones: Neobisiidae)

František ŠŤÁHLAVSKÝ1, Jana CHRISTOPHORYOVÁ2, Hans HENDERICKX3
1 Department of Zoology, Faculty of Sciences, Charles University, Viničná 7, 128 44 Prague 2, Czech Republic; e-mail: stahlf@natur.cuni.cz
2 Department of Zoology, Faculty of Natural Sciences, Comenius University, Mlynská dolina B-1, 842 15 Bratislava, Slovakia; e-mail: christophoryova@gmail.com
3 Department of Biology, Universiteit Antwerpen, Groenenborgerlaan 171, 2020 Antwerpen, Belgium; e-mail: cavexplorer@gmail.com

We present the results of the first study on the karyotypes of four European species of Roncus: Roncus alpinus L. Koch, 1873, Roncus lubricus L. Koch, 1873, Roncus transsilvanicus Beier, 1928 and Roncus sp. The diploid number was 2n = 23 in Roncus sp., 2n = 43 in R. alpinus and R. transsilvanicus and 2n = 45 in R. lubricus. Telocentric autosomes predominate in species with a high chromosome number and metacentric autosomes in Roncus sp. We assume that the ancestral situation for this genus is a high number of chromosomes. A low number of chromosomes is very likely a consequence of centric fusions, which have possibly played a very important role in karyotype evolution in the genus Roncus. All the species analyzed have the X0 sex chromosome system. The X chromosome is metacentric and is the smallest element in the karyotypes of all the species analyzed.

Keywords: Neobisiidae, pseudoscorpion, Roncus, karyotype evolution, sex chromosomes, meiosis

Received: December 4, 2012; Accepted: April 9, 2013; Published: July 11, 2013

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