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Extrusion of yolk masses by hybrid embryos of two cryptic species of Anastrephafraterculus (Diptera, Tephritidae)
Denise Selivon; André Luiz P. Perondini
Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, Caixa Postal 11461, 05422-970 São Paulo, SP, Brasil. Send correspondence to A.L.P.P.
ABSTRACT
Embryos of two cryptic species of Anastrepha fraterculus (type I and type 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 posterior pole were found. In hybrid embryos produced by reciprocal crosses between type I and type II flies, extrusion of yolk masses at the anterior pole occurred at a frequency intermediate between those observed for the embryos of the parental populations. At the posterior pole there were no alterations. These results add evidence that genetic control might be involved in the phenomenon of extrusion of yolk masses by the embryos of Anastrepha species.
Keywords: yolk masses; hybrid embryos; Anastrepha; Tephritidae.
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