title: Pseudascarophis brasiliensis sp. nov. (Nematoda: Cystidicolidae) parasitic in the Bermuda chub Kyphosus sectatrix (Perciformes: Kyphosidae) from southeastern Brazil.
abstract: A new species of Pseudascarophis (Nematoda: Cystidicolidae) found in the stomach of Kyphosus sectatrix (Linnaeus) (Kyphosidae), off Rio de Janeiro, Brazil, is described. The new species can be differentiated from the other congeners by the presence of lateral alae, distinct but inconspicuous cephalic papillae at the anterior end, three pairs of precloacal and one pair of adcloacal papillae in males, egg morphology and morphometry of glandular oesophagus and spicules. Pseudascarophis tropica is transferred to Ascarophis as Ascarophis tropica (Solov'eva) comb. n. due to its ambiguous diagnosis.
authors.affiliation: Curso de Pós-Graduação em Ciências Veterinárias, Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brasil.
authors.forename: Felipe Bisaggio
authors.initials: FB
authors.lastname: Pereira
authors.forename: Aldenice de Nazaré
authors.initials: Ade N
authors.lastname: Pereira
authors.forename: Juan Tomás
authors.initials: JT
authors.lastname: Timi
authors.forename: José Luis
authors.initials: JL
authors.lastname: Luque
mesh_terms: D000818:Animals; D001938:Brazil; D005260:Female; D008297:Male; D008855:Microscopy, Electron, Scanning; D009348:Nematoda / Q000033:anatomy & histology* / Q000145:classification / Q000302:isolation & purification / Q000648:ultrastructure; D010473:Perciformes / Q000469:parasitology*