title: New species of Tereancistrum Kritsky, Thatcher & Kayton, 1980 (Monogenea: Dactylogyridae: Ancyrocephalinae) from the gills of Prochilodus lineatus (Osteichthyes: Prochilodontidae) from the upper Paraná River floodplain, Brazil.
abstract: Two new species of Tereancistrum Kritsky, Thatcher & Kayton, 1980 are described from the gills of Prochilodus lineatus (Prochilodontidae) collected from the upper Paraná River floodplain, Brazil. T. toksonum n. sp. is characterised by a slim ventral bar with a sclerotised membrane along the anterior margin. Another characteristic is the dorsal anchor with an elongated deep root. T. curimba n. sp. is similar to T. ornatus Kritsky, Thatcher & Kayton, 1980 but possesses a sclerotised structure between the accessory sclerites of the ventral anchors. Moreover, the accessory anchor sclerites of this new species are longer than those described for T. ornatus.
authors.affiliation: State University of Maringá - Postgraduate Course in Ecology of Continental Aquatic Environments (PEA), Bloco G-90, Av. Colombo, 5790, 87020-900, Maringá, PR, Brazil.
authors.forename: Maria de los Angeles P
authors.initials: Mde L
authors.lastname: Lizama
authors.forename: Ricardo M
authors.initials: RM
authors.lastname: Takemoto
authors.forename: Gilberto C
authors.initials: GC
authors.lastname: Pavanelli
mesh_terms: D000818:Animals; D001938:Brazil; D005260:Female; D005399:Fishes / Q000469:parasitology*; D005880:Gills / Q000469:parasitology; D008297:Male; D014200:Trematoda / Q000033:anatomy & histology*