All four species of the genus Dichromatos now cytologically analyzed, including D. montanus and D. corupa (Cigliano 2007), studied in the present paper, are 2n = 21(♂)/22(—) (FN = 23/24) with a X1X2Y ♂ / X1X1X2X2 ♀ sex-determination mechanism. The possibility that this mechanism arose from a single ancestral species from which a rapid process of speciation and dispersion took place is discussed.
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1 December 2010
Cytotaxonomy of the Genus Dichromatos Cigliano 2007 (Orthoptera, Acridoidea, Melanoplinae)
Amilton Ferreira,
Alejo Mesa
Journal of Orthoptera Research
Vol. 19 • No. 2
December 2010
Vol. 19 • No. 2
December 2010
centric fusion
chiasma
chromosomes
sex determination
speciation