EXTRUSION OF YOLK MASSES BY HYBRID EMBRYOS OF 2 CRYPTIC SPECIES OF ANASTREPHA-FRATERCULUS (DIPTERA, TEPHRITIDAE)

Embryos of two cryptic species of Anastrepha fraterculus (type I and t ype II) differ in the frequencies at which masses of yolk are extruded from their extremities. In embryos from type I flies, the elimination of masses from the anterior pole occurs at a lower frequency than in type II embryos. No significant differences in extrusion at the poster ior pole were found. In hybrid embryos produced by reciprocal crosses between type I and type II flies, extrusion of yolk masses at the ante rior pole occurred at a frequency intermediate between those observed for the embryos of the parental populations. At the posterior pole the re were no alterations. These results add evidence that genetic contro l might be involved in the phenomenon of extrusion of yolk masses by t he embryos of Anastrepha species.