Marin-Morales, Maria Aparecida [UNESP]Zefa, EdisonBertagna, Maína [UNESP]Mathias, Maria Izabel Camargo [UNESP]Arrigoni, Enrico2014-05-272014-05-272002-10-01Caryologia, v. 55, n. 4, p. 357-360, 2002.0008-7114http://hdl.handle.net/11449/66981Studies on the cytogenetics of Homoptera are scarce. Some references in the literature have reported a chromosome number for the genus ranging from n=5 to 19 and 2n=10 to 2n=39 chromosomes. The genus Mahanarva includes two species of agricultural importance as pests of sugar cane culture in Brazil. We report here the first data concerning the chromosome number and morphology of the species Mahanarva fimbriolata and M. posticata. The chromosome number observed for the two species was 2n=19 for males and 2n=20 for females. The sex determining mechanism of these species was of the XX/X0 type (for males and females, respectively), with chromosome X being the smallest in the complement.357-360engCytogenetics Holocentric chromosomeHomopteraMahanarvaSugar cane pestArtigo10.1080/00087114.2002.10797887WOS:000181065300012Acesso restrito2-s2.0-0041807803