title: New species of Cucullanus (Nematoda: Cucullanidae), an intestinal parasite of the peacock bass Cichla piquiti (Perciformes: Cichlidae) from the Tocantins River, Brazil.
abstract: Cucullanus tucunarensis n. sp. (Cucullanidae) is described parasitizing the peacock bass Cichla piquiti (Cichlidae) from the Tocantins River, Tocantins State, Brazil. The new species is unique and differs from all its congeners by having a tail tip provided with several sclerotized spine-like processes on its ventral side, present in both the male and female. Furthermore, C. tucunarensis n. sp. is compared with other species of the genus recorded in the same zoogeographical region and in the same group of hosts (Perciformes).
authors.affiliation: Programa de Pós-Graduação em Ecologia (POSECO), Departamento de Ecologia e Zoologia,Universidade Federal de Santa Catarina - UFSC, Campus Universitário,s/n, Sala 05, MIP - Córrego Grande,88040-900,Florianópolis,SC,Brazil.
authors.forename: A C F
authors.initials: AC
authors.lastname: Lacerda
authors.affiliation: Laboratório de Ictioparasitologia, Nupelia - Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura,Universidade Estadual de Maringá,Av. Colombo, 5790,87020-900,Maringá,PR,Brazil.
authors.forename: R M
authors.initials: RM
authors.lastname: Takemoto
authors.affiliation: AQUOS - Laboratório de Sanidade de Organismos Aquáticos, Departamento de Aquicultura,Universidade Federal de Santa Catarina - UFSC,Rodovia Admar Gonzaga, 1346,88034-001Florianópolis,SC,Brazil.
authors.forename: N C
authors.initials: NC
authors.lastname: Marchiori
authors.affiliation: AQUOS - Laboratório de Sanidade de Organismos Aquáticos, Departamento de Aquicultura,Universidade Federal de Santa Catarina - UFSC,Rodovia Admar Gonzaga, 1346,88034-001Florianópolis,SC,Brazil.
authors.forename: M L
authors.initials: ML
authors.lastname: Martins
authors.affiliation: Laboratório de Ictioparasitologia, Nupelia - Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura,Universidade Estadual de Maringá,Av. Colombo, 5790,87020-900,Maringá,PR,Brazil.
authors.forename: G C
authors.initials: GC
authors.lastname: Pavanelli
mesh_terms: D000818:Animals; D017162:Ascaridida / Q000033:anatomy & histology / Q000145:classification / Q000254:growth & development / Q000302:isolation & purification*; D017191:Ascaridida Infections / Q000469:parasitology / Q000662:veterinary*; D049628:Body Size; D001938:Brazil; D023681:Cichlids / Q000469:parasitology*; D005260:Female; D005393:Fish Diseases / Q000469:parasitology; D007411:Intestinal Diseases, Parasitic / Q000469:parasitology / Q000662:veterinary*; D008297:Male; D045483:Rivers / Q000469:parasitology