Spinitectus acipenseri Choudhury & Dick 1992

• Main Authors: Arai, Hisao P., Smith, John W.
• Format: Text
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Chromadorea; Spirurida; Cystidicolidae; Spinitectus; Spinitectus acipenseri; Hudson Bay; Canada; Hudson; Rugosa; Holloway; Nelson River
• Online Access: https://dx.doi.org/10.5281/zenodo.5626827; https://zenodo.org/record/5626827

Spinitectus acipenseri Choudhury & Dick, 1992 Includes: Spinitectus gracilis acipenseri of Choudhury, Dick, Holloway & Ottinger (1990); Spinitectus acipenseri of Choudhury & Dick (1991); Spinitectus gracilis acipenseri of Swanson, Kansas, Matkowski & Graveline (1991). Description (after Choudhury & Dick 1992). With characteristics of the genus. “Head” region without spines but rest of body possessing transverse rows of spines. Spine rows discontinuous over lateral lines, appearing as two semicirclets of spines in same plane. First spine row with 20 to 22 spines, numbers increasing posteriorly to as many as 30 (row 6). Spines <0.015 long. Mouth slit-like, bordered by two sublabia with straight inner margins. Four barely visible cephalic papillae, two posterior to each lip base. Amphids not observed. Excretory gland short and narrow with basal nucleus lying beside muscular oesophagus; excretory pore opens between the 4th and 5th spine rows. Nerve ring immediately posterior to 2nd row of spines. Buccal cavity short (Fig. 65 A). Males (measurements of holotype, and range of paratypes in parentheses): Body 4.85 (3.65–6.1) long, 0.091 (0.805–0.124) wide. “Head” 0.104 (0.073–0.132), buccal capsule 0.032 (0.029–0.044), muscular oesophagus 0.243 (0.226–0.336) and glandular oesophagus 0.918 (0.700–1.066) long. Nerve ring 0.125 (0.102–0.161) from anterior end. Left spicule 0.315 (0.300–0.350) long; arcuate, scoop shaped distally, pointed tip. Right spicule 0.100 (0.096– 0.103) long; helically bent like ram’s horn, prominent terminal barb, resembling an heel (Fig. 65 C). Tail 0.127 (0.102–0.139) long. Maximum spine size 0.012 (0.012–0.013). Tail end often twisted into one or two turns. Four pairs pre-cloacal and six pairs post-cloacal pedunculated papillae present (Fig. 65 B). Area rugosa comprises about eight longitudinal rows of cuticular elevations. Females (measurements of allotype, and range of paratypes in parentheses): Body 7.25 (4.2–8.8) long, 0.136 (0.085–0.175) wide. “Head” 0.125 (0.073–0.139), buccal capsule 0.043 (0.029–0.044), muscular oesophagus 0.300 (0.227–0.416), and glandular oesophagus 0.909 (0.643–1.336) long. Nerve ring 0.143 (0.139–0.0.197) from anterior end. Two folded ovaries, one posterior near end of gut (Fig. 65 D), the other in region of glandular oesophagus. Amphidelphic, vagina fairly long, directed anteriorly, opening into prominent vulva with bulbous lip (Fig. 65 E). Tail 0.068 (0.066–0.110) long, bears terminal spine. Maximum spine size 0.012 (0.011–0.015). Vaginal eggs 0.037 (0.034–0.040) x 0.023 (0.023–0.025). Site: alimentary tract Host: Acipenser fulvescens Distribution: Central Canada, Hudson Bay Drainage, Manitoba, Ontario, Saskatchewan Records: Choudhury et al. 1990 (MB, ON, SK); Choudhury & Dick 1991 (MB, SK); Swanson et al. 1991 (MB); Choudhury & Dick 1992 (MB, SK); Choudhury & Dick 1993 (CC); Choudhury & Dick 2001 (HBD) : 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 page 107, DOI: 10.11646/zootaxa.4185.1.1, http://zenodo.org/record/165530 : {"references": ["Choudhury, A. & Dick, T. A. (1992) Spinitectus acipenseri n. sp. (Nematoda: Cystidicolidae) from the lake sturgeon Acipenser fulvescens (Rafinesque) in Canada. Systematic Parasitology, 22, 131 - 140. http: // dx. doi. org / 10.1007 / bf 00009605", "Choudhury, A., Dick, T. A., Holloway, H. & Ottinger, C. (1990) The lake sturgeon \u0336 Acipenser fulvescens (Chondrostei, Acipenseridae) in Canada: preliminary studies on parasitofauna and immunological parameters. In: Interbasin Biota Transfer, North Dakota Water Quality Symposium, 20 - 21 March 1990. North Dakota State University, Fargo, North Dakota.", "Choudhury, A. & Dick, T. A. (1991) Parasites of lake sturgeon, Acipenser fulvescens (Chondrostei: Acipenseridae) from the prairie region of Canada. Program and Abstracts. 30 th Annual Meeting, Canadian Society of Zoologists, Lakehead University, 08 - 11 May 1991. Bulletin of the Canadian Society of Zoologists, 22, p. 30.", "Swanson, G. M., Kansas, K. R., Matkowski, S. M. & Graveline, P. (1991) A report on the fisheries resources of the lower Nelson River and the impact of hydroelectric development, 1989 data. Manitoba Department of Natural Resources. Fisheries Branch, Manuscript Report 91 - 03, 248 pp.", "Choudhury, A. & Dick, T. A. (1993) Parasites of the lake sturgeon, Acipenser fulvescens (Chondrostei: Acipenseridae), from central Canada. Journal of Fish Biology, 42, 571 - 584. http: // dx. doi. org / 10.1006 / jfbi. 1993.1060", "Choudhury, A. & Dick, T. A. (2001) Sturgeons (Chondrostei: Acipenseridae) and their metazoan parasites: patterns and processes in historical biogeography. Journal of Biogeography, 28, 1411 - 1439. http: // dx. doi. org / 10.1046 / j. 1365 - 2699.2001.2811121411. x"]}