Bradabyssa antarctica Salazar-Vallejo 2017, n. comb.
Creators: name: Salazar-Vallejo, Sergio I.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Terebellida
Flabelligeridae
Bradabyssa
Bradabyssa antarctica

description: Bradabyssa antarctica (Hartman, 1978) n. comb.
Figure 13
Ilyphagus antarcticus Hartman, 1978: 170 –173, Fig. 22a–e.
Type material. Antarctica. Holotype (USNM 46823), USCGC Glacier, Cruise 1, Station 1 (74°07' S, 39°39' W), 650 m, 6 Feb. 1968, J.S. Rankin coll.
Description. Holotype (USNM 46823) complete, pale, cylindrical, tapered towards both ends (Fig. 13A); 14 mm long, 1 mm wide, cephalic cage 1.5 mm long, 46 chaetigers, regenerating posteriorly (some parapodia previously removed). Body papillae abundant, rounded short, filiform, capitate, about 6 series per segment in anterior segments, rounded ones less abundant in median and posterior segments (2–3 series per segment), some adherent sediment grains on anterior chaetigers.
Anterior end not exposed; not dissected to prevent further damage. Cephalic cage present, chaetae about as long as 1/10 total length, or 1.5 times longer than body width. Only chaetiger 1 involved in cephalic cage. Cephalic cage chaetae arranged dorsolaterally in short series. Notochaetae and neurochaetae barely separate; 5–6 notochaetae, 3–4 neurochaetae.
Anterior dorsal margin of first chaetiger papillated, slightly depressed; anterior chaetigers without especially long papillae. Chaetigers 1–3 of similar length (Fig. 13A, B). Chaetal transition from cephalic cage to body chaetae abrupt; aristate neurospines present from chaetiger 2. Gonopodial lobes not seen.
Parapodia lateral, slightly developed (Fig. 13D); 3 large papillae between rami. Median neuropodia ventrolateral. Notopodia and neuropodia close to each other. Notopodia reduced, notochaetae emerge from the body wall; all notochaetae multiarticulate capillaries. Neuropodia better developed, lateral foliose outgrowths, with a few papillae.
Median notochaetae arranged in tufts, multiarticulate capillaries, articles medium-sized basally, long medially and distally; 2–3 in anterior and median chaetigers, 4–5 in posterior chaetigers, 2/3 as long as body width. Neurochaetae aristate spines from chaetiger 2, arranged in transverse series (Fig. 13D, E), becoming È-shaped posteriorly, with 2–3 neurospines in anterior chaetigers, 4 in median and posterior ones.
Posterior end tapered, conical (Fig. 13C); pygidium with anus dorsal, muscular ring, anal cirri absent.
Remarks. Ilyphagus antarcticus Hartman, 1978 does not belong in Ilyphagus because it lacks a globose body with abundant filiform papillae. The anterior end has not been examined due to the fact that there is only a single holotype specimen, but on the basis of its integument, papillae and neurochaetae it is being transferred to Bradabyssa as a new combination, B. antarctica (Hartman, 1978) n. comb.
Bradabyssa antarctica resembles B. bransfieldia (Hartman, 1967) n. comb. by having a cylindrical body. As indicated in the key above, they differ because in B. antarctica anterior dorsal papillae are of a similar size, compared with different sizes as present in B. bransfieldia. Furthermore, in B. antarctica notochaetae are fewer and have medium-sized articles basally, whereas they are more abundant and with short articles basally in B. bransfieldia.
Distribution. Weddell Sea, Antarctica.
description: Published as part of Salazar-Vallejo, Sergio I., 2017, Revision of Brada Stimpson, 1853, and Bradabyssa Hartman, 1967 (Annelida, Flabelligeridae), pp. 1-98 in Zootaxa 4343 (1) on pages 30-32, DOI: 10.11646/zootaxa.4343.1.1, http://zenodo.org/record/1041210