Abyssoclymene annularis Species
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“Abyssoclymene annularis, new species
Records: 6:16 sta. 353 (4); 8:2 sta. 723 (fgm);
8: 8 sta. 722 (1); 13:9 sta. 1079 (1); 13:16 sta. 491 (1);
13: 26 sta. 517 (10+, TYPE); 14: 2 sta. 1025 (10+);
14: 3 sta. 525 (2+); 14:4 sta. 1063 (1); 15: 6 sta. 610 (1);
15: 8 sta. 577 (tube); 15:9a sta. 608 (tubes); 18:10 sta. 1154 (3);
18: 12 sta. 913 (1); 18:13 sta. 1146 (1); 18:14 sta. 1150 (1);
18: 16 sta. 902 (1).
Description: The long, cylindrical tubes are closely annulated on their surfaces, which are covered with tan or gray silt; they measure 120 to 230 mm long by 5 to 8 mm wide and have uniform annulations throught their length, with the annuli measuring 1.5 to 2 mm long. An enclosed specimen measures 52 mm long by 5.5 mm wide and consists of 23 segments of which the last four lack setae. The anterior end terminates in a broad cephalic plaque (Fig. A) with a thin marginal flange except where the small, rounded palpode interrupts it. The lateral and dorsal margins are crenulated (Fig. B) and lateral clefts are absent. The parallel nuchal grooves extend through the anterior hald of the plaque. The posterior half is transverselt grooved and radially striated. Eyes are absent.
The first segment is a multiannulated ring with a raised, glandular ridge at its posterior end from which the setigerous fascicles emerge; its setae are entirely long, capillary, and number about 20 in a fascicle. The second segment is about as long as the first one and has a glandular ridge with biramous fascicles of setae; its notopodia resemble those of the first segment, and its neuropodia are represented by a transverse row of rostrate hooks numbering 8 to 25 in a row. Farther back the segments are wider than long, and uncini occur in single rows of rostrate hooks.
The posterior end is slenderer and terminates in a broad plaque with a trim circlet of widely spaced papillae numbering about 24 (Fig. C); none is midverntral or different from others of the series. The pygidium is terminal, within the circlet of papillae. The last four segments, represented by raised transverse ridges, lack setae or uncini.
Notosetae are all of one kind, slender, capillary (Fig. D); neurosetae are rostrate spines with a strong fang surmounted by rows of smaller teeth (Fig. E). The alimentary tract contains fine, white detrital material and shells of diatoms, flat disklike foraminiferans, but no large particles.
Distribution: Circum-Antarctic, in abyssal depths, with most individuals coming from the South Orkney Islands and Weddell Sea.”
|Type Status||Catalog No.||Date Collected||Location||Coordinates||Depth (m)||Vessel|
|Holotype||55572||2/26/1963||Scotia Sea||66.4° S, 45.8° W||4196||Eltanin R/V|
|58167||4/30/1966||Antarctic Ocean||64.1° S, 115.4° W||4866 – 4881||Eltanin R/V|