Hyalopomatus claparedii Marenzeller 1878

Hyalopomatus claparedii Marenzeller, 1878

Hyalopomatus claparedii Marenzeller, 1878, pp. 393–394, pl. 4: fig. 2.—Ehlers, 1887, p. 307.—McIntosh, 1879, p. 217.— Langerhans. 1884, p. 278.—Brattström and Thorson, 1941, p. 21.—Brattström, 1945, p. 1.—Uschakov, 1957, pp. 1668–1669.—Knox, 1959. pp. 110–112, pl. 4: figs. 1–5.—Hartman, 1959, p. 577.

Hyalopomatus claparedi.—Levinsen, 1883, pp. 195, 197, 310; 1887, p. 300—Horst, 1882, p. 3.

Hyalopomatus.—Dons, 1931, p. 5; 1934a, pp. 24–26.

DESCRIPTION (taken from literature only).—Tube white, round and smooth, sometimes with slightly indicated growth rings; distal end free. Whole length of the animal 10–23 mm, about half the length for the gill tuft. About 30 abdominal segments. Collar a thin, transparent membrane composed of three lobes. Thoracic membranes short, ending at the limit of segments 2 and 3. About 10 gill filaments on each side. Operculum a soft transparent vesicle, without any horny or calcified distal plate. Setae of the first thoracic segment with a striated and dendculate limbate zone. Similar setae in the following segments. Anterior and median abdominal segments without setae; posterior segments with isolated capillary neuropodial setae. Thoracic uncini roughly rectangular in shape, rasp-shaped, with numerous small teeth (about 20 when seen in profile) and an anterior bifurcate process. Abdominal uncini similar to those of the thoracic region.

DISTRIBUTION.—Only few records in the Arctic Basin: Off southern Franz-Joseph Land (79° 13′1″N, 63°21′47″E, 230 m), off northern Ellesmere Land (82°39′N to 82°50′N, 93°05′W to 94°10′W, 441 m to 740 m), off north coast of Alaska (80°47′9″N, 170°48′W, 3622 m), Kara Sea, 128 m, between the Hebrides and Iceland? (61°02′N, 12°04′W, 1190 m).