Taxonomic revision of Tatria Kowalewski, 1904 (Cestoda: Amabiliidae): redescriptions of T. appendiculata Fuhrmann, 1908 and T. duodecacantha Olsen, 1939, a key and an amended diagnosis of Tatria (sensu stricto).

Tatria appendiculata Fuhrmann, 1908 is redescribed on the basis of syntypes from Tachybaptus dominicus in Brazil and voucher specimens from the same host species in Cuba previously recorded by Rysavy & Macko (1971). Paratypes of T. duodecacantha Olsen, 1939 from Podilymbus podiceps in the USA are also redescribed and, in contrast with the opinion of Ryzhikov & Tolkacheva (1981), the species is recognised as valid. The major reliable diagnostic characters of Tatria and the distinguishing criteria applicable at the species level are re-evaluated. An amended generic diagnosis of Tatria (sensu stricto) and an identification key to its constituent species are presented.