Raphidascaris acus (Bloch, 1779) Railliet & Henry 1915

• Main Authors: Arai, Hisao P., Smith, John W.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Chromadorea; Rhabditida; Raphidascarididae; Raphidascaris; Raphidascaris acus; Catostomus catostomus
• Online Access: https://doi.org/10.5281/zenodo.5626944; http://treatment.plazi.org/id/038FB248FF20FF2589B9C388234F9D2C

Raphidascaris acus (Bloch, 1779) Railliet & Henry, 1915 Synonyms: Raphidascaris canadensis Smedley 1933; Raphidascaris laurentianus Richardson, 1937; Raphidascaris alius Lyster, 1940 Description (after J. D. Smith 1984a). With characteristics of the genus. Males: 31.5–39.5 (mean 35.3) long, 0.063–0.83 (0.69) maximum width. Lips 0.092–0.118 (0.102) long. Small triangular elevation present between bases of subventral lips (Fig. 84 A). Nerve ring 0.63–0.83 (0.69) and excretory pore 0.73–0.88 (0.80) from anterior end. Preventriculus 3.45–4.11 (3.73) long. Ventriculus and ventricular appendix 1.44–2.07 (1.80) long (Fig. 84 B). Testis tightly coiled, anterior end 6.05–7.84 (6.91) from anterior end of worm. Vas efferens short. Seminal vesicle broad and thin-walled. Ejaculatory duct 1.70–2.57 (2.19) long. Left spicule 0.586–0.802 (0.686) and right spicule 0.544–0.773 (0.681) long. Gubernaculum absent. Caudal papillae extending 3.10–4.27 (3.70) anterior to anus: 16–21 (18) pre-cloacal pairs, two pairs or one pair doubled ad-cloacal, and four pairs post-cloacal. Tail conical, 0.235–0.291 (0.250) long (Fig. 84 C). Phasmids lateral, 0.067–0.140 (100) from tip of tail. Females: 40.5–49.2 (44.5) long, 0.81–1.07 (0.93) maximum width. Lips 0.93–0.132 (0.117) long. Nerve ring 0.60–0.74 (0.68) and excretory pore 0.75–0.84 (0.78) from anterior end. Preventriculus 3.51–4.62 (4.18) long. Ventriculus and ventricular appendix 1.37–2.23 (1.83) long. Vulva 9.83–11.65 (10.85) from anterior end. Didelphic, opisthodelphic, with many eggs, 0.092–0.111 (0.101) x 0.083–0.101 (0.092). Oviducts ascending and descending, not extending anterior to vulva. Ovaries long, much folded, mainly posterior to uterus. Tail conical, 0.50–0.73 (0.61) long. Phasmids 0.18–0.26 (0.22) from tip of tail. Site: intestinal lumen Hosts: Catostomus catostomus (25); Catostomus commersonii (24, 44); Chrosomus eos (44); Coregonus artedi (24); Coregonus clupeaformis (15, 23, 24, 25, 36); Esox lucius (1, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, ...