English

Monophyly and phylogenetic position of the Diplura (Hexapoda)

The structure of the head and mouthparts of the so-called Entognatha were compared. Two different types of entognathy, presumably of independent origin, were differentiated. One form is characteristic of the Ellipura (= Collembola + Protura) while the second is found in the Diplura. The entognathous condition in campodeids and japygids shows remark able similarities in detail, e.g. in the form of the head skeleton and the fusion of the first maxillae with the hypopharynx. Hence, the Diplura are presumed to form a monophyletic group. The reduction of the gonopods and the formation of a genital papilla, as well as the fusion of the abdominal segments X and XI, are regarded as further possible autapomorphic characters of the Diplura. The traditional "Entognatha'' are considered, however, to be a paraphyletic assemblage. The Ellipura form the sister taxon of all other insects; the Diplura constitute the adelphotaxon to the Ectognatha.

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