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A new species of Gieysztoria (Platyhelminthes, Rhabdocoela) from Argentina, and a kinship analysis of South American species of the genus. -Zoologica Scripta , 32 , 449 -457. This study describes a new species of Gieysztoria found in lentic environments in Argentina. Gieysztoria falx sp. n. appears to be closely related to G. therapaina and G. intricata , and is differentiated principally by the presence of two strongly developed pincer-shaped spines of the cuticular stylet. A preliminary analysis of the phylogeny among the South American species of this genus is undertaken, and the monophyly verified. This study constitutes the first approach to interpreting these relationships.

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