Bradabyssa antarctica (Hartman 1978) Salazar-Vallejo 2017
- Dataset
- Revision of Brada Stimpson, 1853, and Bradabyssa Hartman, 1967 (Annelida, Flabelligeridae)
- Rank
- SPECIES
- Published in
- Salazar-Vallejo, Sergio I. (2017): Revision of Brada Stimpson, 1853, and Bradabyssa Hartman, 1967 (Annelida, Flabelligeridae). Zootaxa 4343 (1): 1-98, DOI: 10.11646/zootaxa.4343.1.1
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- order
- Terebellida
- family
- Flabelligeridae
- genus
- Bradabyssa
- species
- Bradabyssa antarctica
description
Description. Holotype (USNM 46823) complete, pale, cylindrical, tapered towards both ends (Fig. 13 A); 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. 13 A, 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. 13 D); 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. 13 D, E), becoming È-shaped posteriorly, with 2 – 3 neurospines in anterior chaetigers, 4 in median and posterior ones. Posterior end tapered, conical (Fig. 13 C); pygidium with anus dorsal, muscular ring, anal cirri absent.
discussion
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.
distribution
Distribution. Weddell Sea, Antarctica.
materials_examined
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.