Cystidicola farionis Fischer, 1798

Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, Zootaxa 4185 (1), pp. 1-274 : 95-97

Cystidicola farionis Fischer, 1798

Synonyms: Cystidicola stigmatura ( Leidy, 1886) Ward & Magath, 1917 (partim); Cystidicola canadensis Skinker, 1930

Description (after Ko & Anderson 1969, and Miscampbell et al. 2004). With characteristics of the genus.

Males: body 16 (14–19) long. Width at nerve ring 0.117 (0.103–0.134), at anus 0.102 (0.104–0.134). Buccal cavity 0.122 (0.113–0.133) long ( Fig. 59 B). Nerve ring 0.315 (0.278–0.319) and excretory pore 0.512 (0.474– 0.577) from anterior end. Muscular oesophagus 0.463 (0.402–0.608) long [length of glandular oesophagus not given]. Cuticular bosses present on ventro-lateral surface of caudal alae. Spicules unequal: left one 0.690 (0.640– 0.730), right one 0.133 (0.103–0.148) long ( Fig. 59 C). Seven to nine double pairs of pre-cloacal papillae present. Four pairs of post-cloacal papillae present, the 1st and 3rd single pairs, the 2nd and 4th double pairs. Phasmids 0.025 (0.016–0.035) from posterior end. Tail 0.196 (0.155–0.227) long ( Fig. 59 C).

Females: body 18 (15–21) long. Width at nerve ring 0.126 (0.124–0.134), at anus 0.100 (0.078–0.113). Buccal cavity 0.128 (0.113–0.134) long. Nerve ring 0.305 (0.278–0.330) and excretory pore 0.462 (0.412–0.515) from anterior end. Muscular oesophagus 0.443 (0.412–0.474) and glandular oesophagus 1.100 (0.958–1.185) long. Uterus amphidelphic, didelphic. Vulva slightly posterior to mid-body length, 11 (8–13) from anterior end. Phasmids 0.035 (0.034–0.037) from posterior end. Tail 0.130 (0.103–0.156) long. Fully developed eggs 0.042 (0.039–0.044) x 0.021 (0.021–0.023), bearing lateral and/or polar filaments ( Fig. 59 D).

Sites: body cavity, mesenteries, stomach, swim bladder

Hosts: Apeltes quadracus (9); Catostomus catostomus (10); Coregonus artedi (3, 4, 5, 17, 19, 30, 31, 35); Coregonus clupeaformis (4, 5, 10, 11, 15, 16, 17, 19, 20, 22, 23, 24, 25, 28, 29, 30, 31, 32, 35); Coregonus hoyi (3, 17, 31); Coregonus nasus (34); Coregonus nigripinnis (17); Coregonus reighardi (3); Coregonus sp. (8); Esox americanus americanus (2); Oncorhynchus gorbuscha (17, 31); Oncorhynchus kisutch (17, 19, 30, 31); Oncorhynchus mykiss (6, 12, 16, 17, 18, 22, 25, 30, 31); Oncorhynchus nerka (22, 25, 30); Oncorhynchus tshawytscha (17); Osmerus mordax (17, 29, 30, 31); Perca flavescens (11); Prosopium coulterii (12); Prosopium cylindraceum (5, 6, 10, 17, 30, 31); Prosopium williamsoni (6, 8, 12, 13, 21, 22, 25); Salmonidae gen. sp. (14); Salmo trutta (17); Salvelinus alpinus (22, 24, 26, 27); Salvelinus fontinalis (17, 33); Salvelinus fontinalis x Salvelinus namaycush (17, 30); Salvelinus malma (13, 18, 21, 22); Salvelinus namaycush (1, 8, 10, 12, 13, 17, 21, 22, 25, 35); Sander vitreus (11); Thymallus arcticus (10)

Distribution: Alberta, Atlantic, British Columbia, Manitoba, Northwest Territories, Newfoundland, Ontario, Quebec, Saskatchewan, Yukon Territory

Records: 1. Wright 1879 (ON); 2. Walton 1928 (ON); 3. Skinker 1930 (ON); 4. Ekbaum 1936 (MB, ON); 5. Bangham 1951 (ON); 6. Bangham & Adams 1954 (BC); 7. Dickson 1964 (MB); 8. Margolis 1967a (BC, ON); 9. Hanek & Threlfall 1970c (AT); 10. Arthur et al. 1976 (YT); 11. Watson 1977 (MB); 12. Mudry & Anderson 1977 (AB); 13. Anon. 1978 (BC); 14. J. D. Smith & Lankester 1979 (ON); 15. Watson & Dick 1979 (MB); 16. Black & Lankester 1980 (EX, ON); 17. Lankester & Smith 1980 (ON); 18. Anon. 1981 (BC); 19. Leong & Holmes 1981 (AB); 20. Samuel 1981 (AB); 21. Arai & Mudry 1983 (BC); 22. G. A. Black 1983c (NT); 23. McAllister & Mudry 1983 (AB); 24. Stewart & Bernier 1983 (NT); 25. Anon. 1984 (BC); 26. Stewart & Bernier 1984 (NT); 27. Black & Lankester 1984 (NT); 28. Dextrase & Lankester 1987 (ON); 29. Dechtiar & Christie 1988 (ON); 30. Dechtiar et al. 1988 (ON); 31. Dechtiar & Lawrie 1988 (ON); 32. Stock 1988 (AB); 33. Marcogliese & Cone 1991a (QC); 34. Choudhury & Dick 1997 (NT); 35. Baldwin & Goater 2003 (AB)

Figures

FIGURE 59. Cystidicola farionis Fischer, 1798. A. female, en face view; B. male, anterior end, lateral view; C. male, posterior end, ventral view; D. fully developed eggs with polar filaments only and with both lateral and polar filaments. (Redrawn from Ko & Anderson 1969).