Spinitectus carolini Holl, 1928

Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, Zootaxa 4185 (1), pp. 1-274 : 108-110

Spinitectus carolini Holl, 1928

Description (after Mueller & Van Cleave 1932, Jilek & Crites 1982a, and Christian 1972). With characteristics of the genus. “Head” region without spines. Four cephalic papillae present. Two amphids each with two pore-like openings situated laterally on pseudolabia ( Fig. 66 A). Deirids between 1st and 2nd spine rows. 15 to 20 sharp spines present per row; spines <0.015 long. Anterior rows of spines arranged in 4 sectors. Spines absent over lateral lines, and decreasing in number and size posteriorly. Buccal cavity relatively long, straight and thin-walled. Muscular oesophagus begins at level of 2nd row of spines, and is about half the width of the glandular oesophagus ( Fig. 66 B).

Males: Body slender 3.31 (2.78–3.45) long, 0.098 (0.087–0.106) wide. Nerve ring 0.145 (0.133–0.151), and excretory pore 0.202 (0.187–0.221) from anterior end. Excretory pore between the 8th and 9th spine rows. Muscular oesophagus 0.172–0.266 long [mean length not given]. Glandular oesophagus 1.403 (1.201–1.497) long. Narrow

caudal alae. Four pairs pre-cloacal and five pairs post-cloacal pedunculate papillae present ( Fig. 66 C). Right

spicule short, proximally expanded, distal tip with large ventral barb [length not reported]. Left spicule long,

slender, evenly curved with tail, divided into shaft and flanged blade [length not reported]. Area rugosa present. Females: Body slender 5.13 (4.35–5.70) long, 0.110 (0.105–0.114) wide. Nerve ring 0.152 (0.140–0.156) and

excretory pore 0.212 (0.203–0.221) from anterior end. Muscular oesophagus 0.194 (0.168–0.235) long, and

glandular oesophagus 1.590 (1.437–1.702) long. Vulva located just posterior to middle of body. Ovijector well

developed. Vagina directed posteriorly ( Fig. 66 D). Amphidelphic. Eggs thick-shelled. Tail with heart-shaped

mucron.

Site: intestinal lumen

Hosts: Ambloplites rupestris (1, 4, 6, 8); Ameiurus nebulosus (6); Amia calva (11); Coregonus clupeaformis (4); Cyprinus carpio (4); Esox lucius (10); Lepomis gibbosus (1, 2, 3, 4, 8, 9); Lepomis macrochirus (8, 9); Micropterus dolomieu (1, 2, 3, 4, 12); Micropterus salmoides (1, 4, 8); Morone americana (9); Morone chrysops (4, 5, 7, 11); Osmerus mordax (4); Perca flavescens (2, 10); Pomoxis nigromaculatus (8); Sander vitreus (4)

Distribution: Ontario

Records: 1. Bangham & Hunter 1939; 2. Bangham 1941; 3. Bangham & Venard 1946; 4. Bangham 1951; 5. Bangham 1955; 6. Dechtiar 1972a; 7. Anthony 1984; 8. Anthony 1985; 9. Dechtiar & Christie 1988; 10. Dechtiar & Lawrie 1988; 11. Dechtiar et al. 1988; 12. Dechtiar & Nepszy 1988

Figures

FIGURE 66. Spinitectus carolini Holl, 1928. A. adult, en face view; B. adult, anterior end, lateral view; C. adult male, posterior end, lateral view; D. adult female, mid-section, vaginal region. (A., C. and D. redrawn from Jilek & Crites 1982 a; B. redrawn from Mueller & Van Cleave 1932)