** Philonema agubernaculum Simon & Simon, 1936 Synonym: ** Philonema salvelini Richardson, 1936 Description (after Simon & Simon 1936). With characteristics of the genus. Males: mean 16.5 (range 12–23) long; mean maximum width 0.296. Mean lengths of the muscular and glandular portions of the oesophagus are 0.404 and 1.122 respectively. Anus to tail tip averages 0.276. Spicules equal, sharply curved, lightly chitinized, mean length 0.284 (Fig. 36 A). Females: 86.1 (49–140) long; mean maximum width 0.771. Mean lengths of muscular and glandular oesophagus 0.553 and 1.172 respectively (Fig. 36 B). Anus to tail tip averages 0.446 (Fig. 36 C). Anus sometimes atrophied in gravid worms. Vulva and vagina atrophied in gravid worms. Small ovary present at each end of body. Uterus of gravid worms filled with embryos and occupying nearly all of the body cavity. Uteri of young specimens contains eggs in various stages of development. Eggs measure 0.032 x 0.046. Embryos 0.343 long. Comments: ** P. agubernaculum requires both redescription and much improved illustrations. A nerve ring is not mentioned in the original description so in Figure 36 B one has been added in a position based on the anatomy of ** P. oncorhynchi (see Fig. 37 B,D). Sites: body cavity, kidneys, liver, swim bladder Hosts: Coregonus artedi (11, 15); Coregonus clupeaformis (6, 21); Gasterosteus aculeatus (8); Oncorhynchus kisutch (9, 11, 15, 33); Oncorhynchus mykiss (4, 7, 12, 14, 19, 21, 33); Oncorhynchus nerka (14, 21, 24, 26, 27, 29, 32, 36); Osmerus mordax (8); Prosopium cylindraceum (6); Prosopium williamsoni (12, 14, 19, 21, 35); Salmo salar (31); Salvelinus alpinus (5, 6, 10, 13, 16, 17, 18, 20, 22, 23, 25, 28, 34, 37); Salvelinus fontinalis (1, 2, 3, 6, 8, 30, 31); Salvelinus malma (14, 21); Salvelinus namaycush (6, 20, 21) Distribution: Alberta, British Columbia, Labrador, Newfoundland, Northwest Territories, Pacific, Quebec Records: 1. Richardson 1936a (QC); 2. Richardson 1936b (QC); 3. Sandeman & Pippy 1967 (NF); 4. Ko & Adams 1969 (BC); 5. Pippy 1970 (NF); 6. Hicks & Threlfall 1973 (LB); 7. Adams 1974 (EX, BC); 8. Hanek & Molnar 1974 (QC); 9. Leong & Holmes 1974 (AB); 10. Jamieson & Freeman 1975 (NT); 11. Leong 1975 (AB); 12. Anon. 1978 (BC); 13. Curtis 1979 (NU); 14. Anon. 1981 (BC); 15. Leong & Holmes 1981 (AB); 16. Dick & Belosevic 1981 (NT); 17. Curtis 1982 (NT); 18. Stewart & Bernier 1982 (NU); 19. Arai & Mudry 1983 (BC); 20. Stewart & Bernier 1983 (NT); 21. Anon. 1984 (BC); 22. Curtis 1984 (NT, QC); 23. Dick 1984 (NT); 24. Groot et al. 1984 (BC); 25. Stewart & Bernier 1984 (NT); 26. Bailey & Margolis 1987 (BC); 27. Bailey et al. 1988 (BC); 28. Bouillon & Dempson 1989 (LB); 29. Groot et al. 1989 (BC); 30. Marcogliese & Cone 1991a (LB, NL); 31. Marcogliese & Cone 1991b (NF); 32. Adamson et al. 1992 (BC); 33. Despres et al. 1995 (BC); 34. Kolasa & Curtis 1995 (QC); 35. Nener et al. 1995 (BC); 36. Bennett et al. 1998 (BC); 37. Desdevises et al. 1998 (QC)

Published as part of Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, pp. 1-274 in Zootaxa 4185 (1) on page 54, DOI: 10.11646/zootaxa.4185.1.1, http://zenodo.org/record/165530