Ferreira, AmiltonMesa, Alejo2014-05-202014-05-202010-01-01Journal of Orthoptera Research. , v. 19, n. 2, p. 233-237, 2010.1082-6467http://hdl.handle.net/11449/19854All four species of the genus Dichromatos now cytologically analyzed, including D. montanus and D. comp (Cigliano 2007), studied in the present paper, are 2n = 21([male])/22([female]) (FN = 23/24) with a X1X2Y [male] / X1X1X2X2 [female] 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.233-237engArtigo10.1665/034.019.0208ZOOREC:ZOOR14707052829Acesso restrito