Systematic position of the enigmatic (Rêgo, 1967) (Cestoda, Cyclophyllidea).

The systematic position of (Rêgo, 1967) (Cestoda, Cyclophyllidea) from the hystricomorph rodent (Wagler) (Caviidae) in Brazil is reevaluated based on published information. is generally thought to belong to the family Catenotaeniidae, being thus the only catenotaeniid cestode parasitizing hystricomorph rodents and also the only catenotaeniid in South America. However, the present study shows that differs fundamentally from Janicki, 1904 sensu lato and other catenotaeniids with respect to several morphologic features, but shares these features with Beddard, 1914 sensu Beveridge (1994), a genus in the family Anoplocephalidae sensu stricto (i.e. sensu Spasskii, 1951). However, is not assigned here to , because the latter is a morphologically heterogeneous genus and will probably be split when subjected to a comprehensive phylogenetic and taxonomic analysis. Instead, Spasskii, 1969 is considered a valid genus in the family Anoplocephalidae s. s. The morphologically closely related Haverkost & Gardner, 2010 from Meyen in Bolivia is assigned to as . (Haverkost & Gardner, 2010) n. comb. An amended diagnosis is provided for .