Parasitic Helminths from Paraguay VII: Systematic Position of Oxyascaris Travassos, 1920 (Nematoda: Cosmocercoidea)

Abstract

Oxyascaris oxyascaris Travassos, 1920, from Bufo paracnemis, Leptodactylus cha- quensis Cei, L. elenae Heyer, L. fuscus (Schneider) (new host records) and L. ocellatus (L.), and Oxyascaris caudacutus (Freitas, 1958) n. comb. (= Pteroxyascaris caudacutus Freitas) from Hylafuscovaria Lutz and H. x-signata nasica Cope of Paraguay are redescribed. New information on the presence of lateral alae, cephalic, oesophageal, and female reproductive morphology permit the following taxonomic conclusions: Pteroxyascaris Freitas, 1958, falls as a synonym of Oxyascaris Travassos, 1920; the Subfamily Oxyascaridinae Freitas, 1958, is synonymized with the Subfamily Cosmocercinae Railliet, 1916 (Cosmocercidae) and Oxyascaris is transferred to Cosmocercinae with an emended diagnosis.