title: Monogenoidean parasites of freshwater stingrays (Rajiformes: Potamotrygonidae) from the Negro River, Amazon, Brazil: species of Potamotrygonocotyle (Monocotylidae) and Paraheteronchocotyle (Hexabothriidae).
abstract: Five new species of Potamotrygonocotyle (Monocotylidae) are described and Paraheteronchocotyle amazonense Mayes, Brooks et Thorson, 1981 (Hexabothriidae) is redescribed from monogenoideans collected on the gills of species of Potamotrygonidae from the Negro River, Amazon, Brazil. Potamotrygonocotyle quadracotyle sp. n. and P. umbella sp. n. were found parasitizing an undescribed species of Potamotrygon; Potamotrygonocotyle rarum sp. n. is described from Potamotrygon schroederi; Potamotrygonocotyle rionegrense inhabits Potamotrygon cf. motoro; Potamotrygonocotyle aramasae sp. n. is a parasite of Paratrygon aiereba; and Paraheteronchocotyle amazonense is reported from Potamotrygon orbignyi. The diagnosis of Paraheteronchocotyle is emended, and P. amazonense is redescribed.
authors.affiliation: Laboratório de Helmintologia Evolutiva, Universidade de São Paulo, Instituto de Biociências, Rua do Matão, trav. 14, no. 321, Cidade Universitària, 05508-900 São Paulo, SP, Brazil. mvdomingues@ib.usp.br
authors.forename: Marcus V
authors.initials: MV
authors.lastname: Domingues
authors.forename: Norberto C M
authors.initials: NC
authors.lastname: Pancera
authors.forename: Fernando P L
authors.initials: FP
authors.lastname: Marques
mesh_terms: D000818:Animals; D001938:Brazil; D005393:Fish Diseases / Q000469:parasitology*; D005880:Gills / Q000469:parasitology; D045483:Rivers; D012860:Skates, Fish / Q000469:parasitology*; D014200:Trematoda / Q000145:classification* / Q000302:isolation & purification / Q000648:ultrastructure; D014201:Trematode Infections / Q000662:veterinary*