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 Capillaria ( Procapillaria ) gracilis (Bellingham, 1840) Travassos, 1915 Synonym: Capillaria kabatai Inglis & Coles, 1963 Description (after Moravec 2001 ). With characteristics of the genus. FIGURE 19. Capillaria ( Procapillaria ) gracilis (Bellingham, 1840) Travassos, 1915 . A. male, posterior end; B. male, tail, ventral view; C. female, vulvar region with appendage. (Redrawn from Moravec 2001) Males: Body length 7.14–8.42 long, maximum width 0.041–0.054. Muscular oesophagus 0.180–0.396 long, stichosome 4.04–6.85, 47 stichocytes. Nerve ring 0.111 from anterior end. Spicule slender, 0.975–1.375 long, posterior half with rough transverse grooves ( Fig. 19 A). Cloaca opening subterminal. Tail rounded, 0.009–0.018 long, with ventro-lateral lobe, 0.018–0.027 long, on either side, each probably with a papilla ( Fig. 19 B). Pair of large sessile adcloacal papillae at lobe bases. Females: Gravid worms 13.20–35.16 long, maximum width 0.068–0.095. Muscular oesophagus 0.225–0.450 long, stichosome 5.04–8.73, 38–51 stichocytes. Nerve ring 0.081–0.114 from anterior end. Vulva with appendage 0.027–0.123 behind oesophago-intestinal junction ( Fig. 19 C); rarely gravid females lack the appendage. Uterus with many eggs in one row near vulva. Mature eggs 0.072–0.090 x 0.027–0.036. Site: intestine Hosts: Anarhichas lupus (2); Hippoglossoides platessoides (2); Hippoglossus hippoglossus (2); Macrourus berglax (3); Merluccius albidus (4); Merluccius bilinearis (1); Myoxocephalus octodecemspinosus (5); Nezumia bairdii (3); Urophycis chuss (4); Urophycis tenuis (4) Distribution: Atlantic Records: 1. Gaevskaya & Umnova 1977 ; 2. Zubchenko 1980 ; 3. Zubchenko 1981a ; 4. Scott 1987 ; 5. Moravec 1987