title: [Comparative study of the ovarioles of two sympatric species of heteropterans, Pyrrhocoridae: Roscius elongatus and Roscius brazzavilliensis: the onset of meiosis].
abstract: Seven distinct periods may be recognised during ovarioles development. The timing of events is different in each species. In Roscius elongatus the first oocytes appear by the end of the fourth larval instar. In Roscius brazzavilliensis the meiosis starts later, in the middle of the fifth instar.
mesh_terms: D000818:Animals; D004777:Environment; D005260:Female; D007313:Insecta / Q000502:physiology*; D008540:Meiosis; D009866:Oogenesis; D010053:Ovary / Q000166:cytology / Q000502:physiology*; D013045:Species Specificity; D013997:Time Factors
vernacular_title: Etude comparée de l'évolution des ovarioles chez deux espèces sympatriques d'Hétéroptères, Pyrrhocoridae: Roscius elongatus et Roscius brazzavilliensis; moment d'apparition de la méïose