Camallanus ancylodirus Ward & Magath, 1917

Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, Zootaxa 4185 (1), pp. 1-274 : 61-62

** Camallanus ancylodirus Ward & Magath, 1917

Description (after Baker 1979). With characteristics of the genus. Slender worms with blunt anterior end, and posterior end. Males about two-thirds size of gravid females. Head bent slightly ventrally in mature worms. Cuticle 0.007 thick with faint longitudinal and transverse striations. Mouth opening elongate. Four cephalic papillae observed. Amphids not observed. Buccal capsule with identical lateral valves, each with numerous irregular, slender, longitudinal ridges. A pair of sclerotized plates near anterior margin of each buccal valve. Posterior end of buccal cavity surrounded by prominent sclerotized ring. Tridents prominent, with pair of elongate, equal, lateral processes and elongate medial process. Oesophagus divided into slender anterior muscular portion and slender posterior glandular portion ( Fig. 39 A).

Males (two specimens): 15.2 and 17.1 long. Buccal valves 0.137 and 0.39, tridents 0.173 and 0.186, muscular oesophagus 1.08 and 1.15, and glandular oesophagus 0.70 and 1.00 long. Nerve ring 0.318 and 0.346 from anterior end. Posterior end with prominent protuberance in anal region and ventral groove-like constriction in mid-region of tail. Tail 0.138 and 0.157 long, tapering to blunt terminal point. Caudal end with 11 pairs of subventral pedunculate papillae distributed as follows: seven pre–cloacal pairs arranged in two rows with papillae in each row evenly spaced, and four post-cloacal pairs with the three most anterior pairs arising closely together from hypodermis. All pedunculate caudal papillae contained within prominent caudal alae. Hypodermal protuberance in anal region with one pre-cloacal and one post-cloacal pair of sessile papillae. Sessile papillae with band of thick cuticle extending laterally to base of protuberance ( Fig. 39 B). Spicules prominent, unequal, curved in lateral view, with blunt capitulum and tubular shaft ending distally in sharp point. Right spicule with robust shaft, 0.277–0.290 long; left one relatively slender, 0.218–0.239 long.

Females (four specimens): 24.2–26.2 long. Buccal valves 0.170–0.186, tridents 0.178–0.215, muscular oesophagus 1.16–1.39, and glandular oesophagus 1.31–1.39 long. Nerve ring 0.337–0.361 from anterior end. Vulva small and round, opening into cup-shaped projection of the cuticle, 9.4–11.5 from posterior end. Cuticle beside vulva forming an elongate ridge about 0.250 long. Tail 0.451–0.480 long, tapering to blunt point. Anus inconspicuous. Posterior part of uterus extending behind anus to mid-region of tail ( Fig. 39 C). Uterus contains numerous larvae.

Site: intestine

Host: Carpiodes cyprinus

Distribution: Ontario

Record: Dechtiar & Nepszy 1988

Figures

FIGURE 39. Camallanus ancylodirus Ward & Magath, 1917. A. female, anterior end, lateral view; B. male, posterior end, lateral view; C. female, posterior end, lateral view. (Redrawn from Baker 1979)