Huffmanela canadensis Moravec, Conboy & Speare, 2005

Description (after Moravec et al. 2005). With characteristics of the genus.

Males (holotype measurements in parentheses): 3.441–3.862 (3.441) long, 0.045–0.063 (0.045) maximum width. Entire oesophagus 1.333–1.346 (1.333), muscular oesophagus 0.147–0.153 (0.153), and stichosome 1.180– 1.199 (1.180) long; 40–42 (42) stichocytes (Fig. 25 A). Nerve ring 0.048–0.069 (0.069) from anterior end. Single testis reaches anteriorly to near oesophago-intestinal junction (Fig. 25 B). Cloaca long (0.093 in holotype). Tail slightly narrowed, rounded, bearing pair of large pre-anal papillae. Cloacal aperture slightly depressed (Fig. 25 C).

Females (allotype measurements in parentheses): gravid worms 7.711–8.160 (17.711) long, 0.090–0.105 (0.090) maximum width. Entire oesophagus 1.768–2.054 (1.768), muscular oesophagus 0.180–0.216 (0.210), and stichosome 1.558–1.838 (1.558) long; 32–37 (35) stichocytes. Nerve ring 0.075–0.078 (0.078) from anterior end. Vulva slightly posterior to oesophago-intestinal junction, anterior vulvar lip elevated (Fig. 25 D). Vagina short. Ovary single, posteriorly extending to end of intestine. Colourless rectum 0.111 (0.099) long, anus terminal (Fig. 25 E). In utero eggs with polar plugs, oval, light coloured, non-embryonated, shell appears two-layered (Fig. 25 F). Eggs 0.032–0.039 x 0.024–0.027 (0.036–0.039 x 0.024–0.027). Eggs in anterior uterus arranged in one row, two to three rows posteriorly.

Advanced eggs in host skin are dark brown, oval, with two-layered wall, surface with many transverse, somewhat oblique, complete or incomplete ridges. Polar plugs light coloured, height 0.006–0.009. Eggs including the polar plugs 0.048–0.063 (mean 0.054) x 0.024–0.027 (mean 0.026) containing a fully formed larva (Fig. 25 G,H).

Sites: skin of fins and adjacent skin

Hosts: Sebastes spp.

Distribution: Pacific

Records: Conboy & Speare 2002; Moravec et al. 2005