“…The sex-determination pattern considered the ancestor of grasshoppers was present in specimens of Abracris
flavolineata , with males with the X0 and females with the XX sex chromosome system. In Acrididae, some species, such as Rhammatocerus
brasiliensis (Bruner, 1904), R.
brunneri (Giglio-Tos, 1895), R.
palustris Carbonell, 1988, R.
pictus (Bruner, 1900), Orthoscapheus
rufipes (Thunberg, 1824), among others, show a karyotype similar to that of Abracris
flavolineata , with 2n = 23,X0 and 24,XX, being considered the ancestral pattern of the family (White 1973; Loreto et al 2008b; Rocha et al 2011). …”