Classification of the Temnocephaloidea (Platyhelminthes)

Abstract
A brief historical survey of the classification of the Temnocephaloidea is presented. Schemes of classification are discussed in the light of recent anatomical and ultrastructural studies on Temnocephala. The Temnocephaloidea are not closely related to the Monogenea; they show an immediate affinity with the Turbellaria, which should be reflected by their taxonomic position. Inclusion of the group within the Turbellaria requires a distortion of the class diagnosis; it is suggested that the Turbellaria and Temnocephaloidea be combined to form a superclass. Characteristics of the proposed superclass are summarized.

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