Guide to the Parasites of Fishes of Canada Part V: Nematoda Author Arai, Hisao P. Author Smith, John W. text Zootaxa 2016 4185 1 1 274 journal article 10.11646/zootaxa.4185.1.1 11620862-ddcf-4c01-b0d9-32867e03d74b 1175-5326 165530 0D054EDD-9CDC-4D16-A8B2-F1EBBDAD6E09 Salmonema prevosti (Choquette, 1951) Moravec, Santos & Brasil-Sato, 2008 Synonym: Metabronema prevosti Choquette, 1951 Description (after Choquette 1951b ). With characteristics of the genus. Slender worms, the greatest width near posterior end, cuticle with transverse striations. Mouth opening dorso-ventrally elongated, surrounded by two slightly trilobed pseudolabia, leading to vestibule. Four large cephalic papillae at base of pseudolabia ( Fig. 62 A). Oesophagus comprises a muscular and a longer glandular portion. Males (two specimens in “rather poor condition” were available—most measurements are for the type specimen only): 7.0 and 10.0 long. Vestibule 0.12, muscular oesophagus 0.38, and glandular oesophagus 2.91 long. Nerve ring 0.19 and excretory pore 0.30 from anterior end. Posterior end coiled with well developed caudal alae supported by four pairs pre-cloacal and five pairs post-cloacal papillae ( Fig. 62 B). Spicules unequal: left ones 0.8 and 1.2, and right ones 0.08 and 0.12. Gubernaculum not seen. Females (14 specimens were available): 9.4 to 13.2 long. Vestibule 0.10 to 0.16, muscular oesophagus 0.22 to 0.39, and glandular oesophagus 1.67 to 2.35 long. Nerve ring 0.14 to 0.20, and excretory pore 0.22 to 0.25 from anterior end. Vulva situated slightly posterior to mid body. Eggs embryonated, 0.048 to 0.051 x 0.025, bear “coarse filaments at either poles which are provided with knobs”. Site: intestinal lumen Host: Ameiurus nebulosus Distribution: Quebec Record: Choquette 1951b