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The embryogenesis of the barley sawfly Trachelus tabidus F., very abundant in the Duero Basin, has been studied. It is a contribution to the research of fundamental features to establish a revision of the phylogenetic relationships among the taxons of Hymenoptera. Such relationships are subjectively based today on teh adult morphology, because of the lack of fossil records. The U-shaped late embryo moves and hatches from the chorion differently then those of Hymenoptera Apocrita reported by several authors.There is not an obliged rotation of the late embryo on its long axis.

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