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Gyulavári, H.A., Felföldi, T., Benken, T., Szabó, L.J., Miskolczi, M., Cserháti, C., Horvai, V., Márialigeti, K., Dévai, G. 2011. Morphometric and molecular studies on the populations of the damselflies Chalcolestes viridis and C. parvidens (Odonata, Lestidae). International Journal of Odonatology, 14, 329-339.
Rövid leírás: 

Morphometric and genetic differences were analysed for two closely related damselflies, Chalcolestes
viridis
and C. parvidens. A total of 305 male individuals were collected from six European countries
(Austria, Croatia, Germany, Greece, Hungary and Portugal). Measurements from a total of 28 populations
of C. viridis and C. parvidens and several intermediate forms were collected to determine if they can be
definitely distinguished using simple morphometric characters. DNA sequences from two independent
loci (nuclear ribosomal ITS region and mitochondrial cytochrome oxidase I gene) were analysed to test
whether these taxa represent separate monophyletic groups as well as to compare the genetic distance with
those found between well-accepted European Lestes species. Discriminant analysis revealed that C. viridis
and C. parvidens are differentiated in morphometric space. Individuals with intermediate anal appendage
traits overlapped with both C. viridis and C. parvidens which raised the possibility that they are merely
subspecies of a single species. However, genetic analysis of both investigated DNA regions showed that the
two Chalcolestes taxa did not share haplotypes, indicating their status as true species. Furthermore, they
formed a monophyletic group separated from the investigated Lestes species, supporting the recognition
of the genus Chalcolestes. The two Chalcolestes species are very closely related compared with European
Lestes species, suggesting that their divergence occurred relatively recently.

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