Rhabdochona zacconis Yamaguti, 1935

Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, Zootaxa 4185 (1), pp. 1-274 : 80-82

publication ID

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

publication LSID

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

DOI

https://doi.org/10.5281/zenodo.5626742

persistent identifier

https://treatment.plazi.org/id/038FB248-FFFE-FFE7-89B9-C38F223F9F6C

treatment provided by

Plazi

scientific name

Rhabdochona zacconis Yamaguti, 1935
status

 

Rhabdochona zacconis Yamaguti, 1935

Description (after Moravec, Margolis & Boyce 1981). With characteristics of the genus. Medium-sized worms with smooth cuticle. Mouth approximately hexagonal, slightly compressed dorso-ventrally, surrounded by two large lateral amphids and four small sub-apical papillae. Prostom thick-walled, funnel-shaped, without basal teeth but with 14 teeth projecting anteriorly. Deirids medium-sized, bifurcate, located posterior to middle of vestibule ( Fig. 51 View FIGURE 51 A). Tail of both sexes conical, ending in sharp point ( Fig. 51 View FIGURE 51 B,E).

Males: body 6.69–10.06 long, 0.122–0.177 maximum width. Prostom 0.018–0.021, vestibule including prostom 0.135–0.207, muscular oesophagus 0.279–0.390 and glandular oesophagus 2.45–4.90 long. Deirids 0.075–0.090, nerve ring 0.192–0.237 and excretory pore 0.303 from anterior end. Pairs of subventral pre-cloacal papillae variable in number; the following combinations were observed: 7+8, 8+9 and 9+9. Another pair was located laterally at level of 3rd subventral pair. Six pairs of post-cloacal papillae present, the 2nd pair lateral, the rest subventral ( Fig. 51 View FIGURE 51 B). Longitudinal ventral cuticular ridges anterior to pre-cloacal papillae well developed. Left spicule 0.435–0.510 long and 0.012–0.015 wide at mid-length, shaft representing its anterior half, with its distal tip moderately extended, provided with wide cuticular membrane forming large ventral process ( Fig. 51 View FIGURE 51 C). Right spicule 0.108–0.120 long, boat-shaped, sometimes with dorsal barb on distal tip ( Fig. 51 View FIGURE 51 D). Length ratio of right to left spicule 1:3.84 to 1:4.47. Tail conical, 0.354–0.411 long, its tip with sharp point ( Fig. 51 View FIGURE 51 B).

Females: body 16.32–18.31 long, 0.245– 0.285 maximum width. Prostom 0.030–0.033, vestibule including prostom 0.177–0.210, muscular oesophagus 0.450–0.525 and glandular oesophagus 4.15–5.98 long. Deirids 0.105–0.123, nerve ring 0.264–0.309 and excretory pore 0.414–0.453 from anterior end. Tail conical, 0.273–0.303 long, its tip with sharp point ( Fig. 51 View FIGURE 51 E). Vulva post-equatorial, located 6.94 –8.30 from posterior end. Eggs elongate–oval, 0.036–0.039 x 0.021. Each pole of mature eggs (containing larvae) with one, less frequently two, narrow filaments up to 0.57 long ( Fig. 51 View FIGURE 51 F).

Site: intestine

Host: Catostomus macrocheilus Distribution: British Columbia Records: Anon. 1978; Arai & Mudry 1983

Kingdom

Animalia

Phylum

Nematoda

Class

Secernentea

Order

Spirurida

Family

Thelaziidae

Genus

Rhabdochona

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