Cucullanellus cotylophora (Ward & Magath, 1917) Petter 1974

• Main Authors: Arai, Hisao P., Smith, John W.
• Format: Text
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Secernentea; Ascaridida; Cucullanidae; Cucullanellus; Cucullanellus cotylophora; Canada; Midland; Burbot; Lota lota; lota
• Online Access: https://dx.doi.org/10.5281/zenodo.5626993; https://zenodo.org/record/5626993

Cucullanellus cotylophora (Ward & Magath, 1917) Petter, 1974 Synonyms: Dacnitoides cotylophora Ward & Magath, 1917; Dichelyne cotylophora (Ward & Magath, 1917) Gendre 1927 (?1928) Description (after Baker 1984). With characteristics of the genus. Body robust. Cuticle relatively thick, 0.020– 0.050 near mid-body, with faint irregularly spaced striations. Mouth opening slightly inclined dorsally, dorsoventrally elongated in large specimens, surrounded by raise collarette with rib-like thickenings. Six small inner labial papillae, and four outer double cephalic papillae present. Cheilostom absent. In large worms (> 5 mm long), oesophastom well developed, consisting of anterior dorso-ventrally elongate ring forming the mouth and extending posteriorly in a funnel-shaped triradiate structure lining the lumen of anterior third of oesophagus; three lobes of funnel portion with sharp processes on outer edges extending into oesophageal musculature; ventral edge of oesophastomal ring with short bilobed process extending on top of adjacent oesophageal tissue; dorso-lateral edges of ring with pair of blindly ending, wide, flat cuticular processes extending posteriorly over exterior surface of oesophagus; lateral edges of ring with pair of blindly ending elongate processes extending posteriorly over surface of oesophagus and connected to lining of oesophageal lumen by thin cuticular connective running through oesophagus. In small worms (<2 mm long) oesophastom relatively weakly sclerotized, oesophastomal ring more ovoid in apical view than in larger worms; dorso-lateral and lateral pairs of blindly ending processes on ring relatively short and undeveloped; lumen of oesophastom relatively thin. Oesophagus wide at anterior and posterior ends. Excretory pore posterior to oesophagus. Ventral intestinal caecum well developed in large worms, extending anterior to oesophagus; less well developed in small worms (Fig. 96 A). Anterior pair of digitiform deirids near posterior end of oesophagus; another pair deirid-like digitiform papillae just posterior to mid-body. Males: 1.14–6.48 long. Oesophagus 0.212–0.567 long. Nerve ring 0.084–0.208, and excretory pore 0.253– 0.824 from anterior end. Tail 0.078–0.151, spicules 0.233–1.024, and gubernaculum 0.050–0.098 long. Ten pairs and one unpaired caudal papillae present (Fig. 96 B): tail with one lateral pair, two subventral pairs, and one subdorsal pair; area adjacent to and just anterior to cloaca with three pairs closely spaced subventral papillae and one unpaired papilla on cloacal lip; pre–cloacal region with three pairs subventral papillae distributed relatively anteriad. Large pair lateral phasmids near middle of tail. Large mature males with 18 pairs muscle cells extending to large protruding pre-cloacal sucker. Small males have poorly developed sucker, not protruding. Spicules of large worms heavily sclerotized with lateral alae in medial portion; in small worms spicules weakly sclerotized, alae not differentiated. Gubernaculum heavily sclerotized in large worms. Testis relatively undifferentiated in small worms, not patent with developing vas deferens . Testis connected to vas deferens when worms 2.2 long; sexual maturity seen at 3.5 long. Females: 1.19–7.17 long. Oesophagus 0.221–0.655 long. Nerve ring 0.074–0.229, excretory pore 0.291–0.914, and vulva 0.075–4.47 from anterior end. Tail 0.086–0.191 long, conical with pair large lateral phasmids near middle (Fig. 96 C). Amphidelphic, each uterus with up to 100 eggs at 1–4 cell stage. Eggs 0.070–0.073 x 0.047– 0.055. Site: intestinal lumen Hosts: Ambloplites rupestris (6); Ameiurus melas (2); Ameiurus nebulosus (3); Aplodinotus grunniens (2, 13); Centrarchidae gen. sp. (17); Esox americanus vermiculatus (2); Lepomis gibbosus (19); Lepomis macrochirus (2); Lota lota (10, 18); Luxilus cornutus (16); Micropterus dolomieu (2, 6, 19, 21); Micropterus salmoides (2, 6); Morone americana (9, 19); Morone chrysops (2, 14); Perca flavescens (1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 15, 16, 19, 20, 21, 22, 23); Sander vitreus (2, 6, 19) Distribution: Manitoba, Ontario, Quebec Records: 1. Smedley 1934 (ON); 2. Bangham & Hunter 1939 (ON); 3. Bangham 1941 (ON); 4. Bangham & Venard 1946 (ON); 5. Worley & Bangham 1952 (QC); 6. Bangham 1955 (ON); 7. Tedla 1969 (ON); 8. Tedla & Fernando 1969a (ON); 9. Tedla & Fernando 1969b (ON); 10. Dechtiar 1972a (ON); 11. Tedla & Fernando 1972 (ON); 12. Cannon 1973 (ON); 13. Anthony 1982 (ON); 14. Anthony 1984 (ON); 15. Baker 1984a (ON); 16. Baker 1984b (ON); 17. Anthony 1985 (ON); 18. Anthony 1987 (ON); 19. Dechtiar & Christie 1988 (ON); 20. Dechtiar & Lawrie 1988 (ON); 21. Dechtiar & Nepszy 1988 (ON); 22. Dechtiar et al. 1988 (ON); 23. Choudhury & Dick 1996b (MB) : 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 pages 166-168, DOI: 10.11646/zootaxa.4185.1.1, http://zenodo.org/record/165530 : {"references": ["Smedley, E. M. (1934) Some parasitic nematodes from Canadian fishes. Journal of Helminthology, 12, 205 - 220. http: // dx. doi. org / 10.1017 / s 0022149 x 00004260", "Bangham, R. V. & Hunter, G. W. III. 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