Ascarophis filiformis Polyanski, 1952

Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, Zootaxa 4185 (1), pp. 1-274: 86-90

publication ID

http://doi.org/10.11646/zootaxa.4185.1.1

publication LSID

lsid:zoobank.org:pub:0D054EDD-9CDC-4D16-A8B2-F1EBBDAD6E09

DOI

http://doi.org/10.5281/zenodo.5626774

persistent identifier

http://treatment.plazi.org/id/038FB248-FFE4-FFEF-89B9-C00621B89CF0

treatment provided by

Plazi

scientific name

Ascarophis filiformis Polyanski, 1952
status

 

Ascarophis filiformis Polyanski, 1952  

Description (after Appy 1981). With characteristics of the genus.

Males: 12.4 (9.0–14.7) long, 0.105 (0.077–0.130) wide at vas deferens. Muscular oesophagus 0.343 (0.260– 0.403) and glandular oesophagus 2.117 (1.445–2.864) long. Deirids, nerve ring and excretory pore 0.175 (0.140– 0.209), 0.219 (0.185–0.258) and 0.325 (0.264–0.367), respectively, from anterior end ( Fig. 54 View FIGURE 54 A). Tail 0.158 (0.125–0.189) long. Right spicule 0.109 (0.094–0.129) long, spicule arcuate, notched distally. Left spicule 0.328 (0.271–0.392) long, tubular, divided into proximal shaft and blade. Ratio of left to right 1:3.0 (1:2.5 to 1:3.5). Area rugosa with about 11 longitudinal rows of cuticular elevations. 10 pairs caudal papillae: two double pairs precloacal, six pairs post-cloacal; 5th post-cloacal pair relatively small, ventral to 6th pair. Caudal alae narrow. Phasmids behind last pair post-cloacal papillae ( Fig. 54 View FIGURE 54 B).

Females: 25.1 (19.3–35.9) long, 0.160 (0.112–0.207) wide at vulva. Muscular oesophagus 0.386 (0.330–0.462) and glandular oesophagus 2.606 (1.845–3.424) long. Deirids, nerve ring, excretory pore and vulva 0.186 (0.143– 0.228), 0.228 (0.179–0.265), 0.340 (0.258–0.415) and 12.7 (9.5–18.3), respectively, from anterior end. Tail 0.090 (0.058–0.120) long ( Fig. 54 View FIGURE 54 C). Eggs 0.047 (0.042–0.050) x 0.031 (0.028–0.035) with two filaments arising from prominent knob at one pole ( Fig. 54 View FIGURE 54 D).

[For comments on A. filiformis   see page 90–91]

Site: stomach

Hosts: Boreogadus saida   (9); Gadus morhua   (1, 2, 3, 4); Hippoglossus stenolepis   (7, 8); Liparis dennyi   (5); Reinhardtius hippoglossoides   (6)

Distribution: Atlantic, Nunavut, Pacific

Records: 1. Redkozubova 1976 (AT); 2. Linkletter et al. 1977 (AT); 3. Appy 1981 (AT); 4. Appy & Burt 1982 (AT); 5. Ko 1986 (PA); 6. Arthur & Albert 1994 (AT); 7. Blaycock 1996 (PA); 8. Blaycock et al. 1998a (PA); Køie 2009 (NU)

Ascarophis morrhuae van Beneden, 1871  

Description (after Ko 1986). With characteristics of the genus.

Males: 5.9 (5.1–7.2) long, 0.028 (0.026–0.029) wide at nerve ring. Buccal cavity 0.097 (0.086–0.108) long ( Fig. 55 View FIGURE 55 A). Muscular oesophagus 0.271 (0.226–0.297) and glandular oesophagus 1.75 (1.34–2.43) long. Nerve ring 0.134 and excretory pore 0.242 from anterior end. Four pairs pre-cloacal, and six pairs post-cloacal papillae. Left spicule 0.765 (0.740–0.790), right spicule 0.098 (0.095–0.100) long ( Fig. 55 View FIGURE 55 B). Tail 0.105 (0.084–0.134) long.

Females: 10.8 (8.5–12.7) long, 0.036 (0.031–0.041) wide at nerve ring. Buccal cavity 0.098 (0.085–0.115) long. Muscular oesophagus 0.246 (0.216–0.288) and glandular oesophagus 1.9 (1.1–2.3) long. Nerve ring 0.140 (0.113–0.178) and excretory pore 0.212 (0.161–0.240) from anterior end. Vulva 5.3 (4.7–6.0) from posterior end. Uterus extends from region of glandular oesophagus almost to tail tip. Tail 0.116 (0.072–0.146) long with knoblike tip ( Fig. 55 View FIGURE 55 C). Embryonated eggs 0.036 (0.026–0.046) x 0.024 (0.022–0.026) with one polar plug bearing two filaments although, according to Ko (1986), eggs in the posterior extension of the uterus apparently lack filaments ( Fig. 55 View FIGURE 55 C).

[For comments on A. morrhuae   see below]

Site: alimentary tract

Hosts: Alosa sapidissima   (4); Anarhichas lupus   (3); Gadus morhua   (2); Gasterosteus aculeatus   (1);

Glyptocephalus cynoglossus   (3)

Distribution: Atlantic, Labrador, Newfoundland

Records: 1. Hanek & Threlfall 1970a (AT, LB, NL); 2. Gaevskaya & Umnova 1977 (AT); 3. Zubchenko 1980 (AT);

4. Hogans et al. 1993 (AT)