Bradabyssa mammillata (Grube 1877) 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 mammillata
description
Description. Syntypes (ZMB 689) fusiform, oval in cross section, incurved, slightly to markedly narrower posteriorly (Fig. 26 A); up to 67 mm long (USNM 56665, 101 mm long), 4.5 – 10 mm wide, cephalic cage 2 – 5 mm long (other specimens with chaetae broken), 27 – 30 chaetigers (USNM 56664, 36 chaetigers). Dorsal tubercles large, globular, in three transverse series per chaetiger, middle series with 5 – 6 larger, stiff, other series with tubercles less than half as large (Fig. 26 B); ventral papillae in three rows, rounded (eroded in several syntypes); without tunic, sediment grains adherent to papillae and body tegument. Cephalic hood not exposed. Anterior end observed by dissection and in non-type specimen (MNHN 186). Prostomium low cone, anterior eyes poorly defined; posterior ones in low rounded lobes. Caruncle extended posteriorly separating branchial plate, median keel pale, lateral ridges dark (Fig. 26 D). Palps folded; palp keels well developed, rounded. Branchiae cirriform, sessile on branchial plate, arranged in irregular rows, over 100 per lateral group, some filaments longer than palps. Lateral lips well developed, thick; dorsal lip pigmented, reduced; ventral lip not seen. Nephridial lobes distinct, pale brown, tubular, separated from branchial plate. Cephalic cage chaetae as long as 1 / 5 – ½ body width; chaetae of chaetigers 1 – 3 slightly longer, directed forward. Chaetae arranged in short lateral series, about 6 capillary chaetae per ramus. Anterior dorsal margin of first chaetiger with two large rounded papillae. Chaetigers 1 – 3 of similar length, parapodial development similar. Chaetal transition from cephalic cage to body chaetae abrupt; aristate neurospines present from chaetiger 2. Gonopodial lobes black, in chaetiger 5 (Fig. 26 C, one syntype with a small accessory papilla in chaetiger 6). Parapodia well developed, lateral. Median neuropodia ventrolateral. Notopodia and neuropodia close to each other. Notopodia less developed than neuropodia, anterior chaetigers with a large trifid rounded infrachaetal papilla, median chaetigers with papillae bifid, posterior chaetigers with single rounded or no infrachaetal papilla. Neuropodia projecting rounded lobes, 3 – 4 rounded marginal papillae. Median notochaetae arranged in longitudinal short series; all notochaetae multiarticulate capillaries, most chaetae with short articles basally and medially, medium-sized or long distally, one chaetae with long articles basally (Fig. 26 E), 4 – 6 per ramus, 1 / 6 as long as body width. Aristate neurospines from chaetiger 2, most broken, arranged in J-shaped patterns, 4 – 5 per ramus (Fig. 26 F); neurochaetae with very short rings, tips broken, visible in juvenile or smaller specimens (Fig. 26 G). Posterior end tapered; pygidium blunt cone, anus terminal, anal cirri absent. Variation. The different size ranges in the type material shows that the tough body, provided with large globular dorsal tubercles, is a stable feature. The shortest syntype (ZMB- 688) is 10 mm long, and shows these features, even though it was fixed in alcohol. Syntypes were 10 – 67 mm long, 4.5 – 10.0 mm wide, cephalic cage 2 – 5 mm long, 27 – 31 chaetigers. Additional specimens 22 – 101 mm long, 5 – 12 mm wide, cephalic cage 3 – 7 mm long, 26 – 35 chaetigers.
discussion
Remarks. Bradabyssa mammillata (Grube, 1877) n. comb. resembles B. verrucosa (Chamberlin, 1919) n. comb. by having tubercles of different sizes. They differ because B. mammillata has chaetigers 1 – 3 equally developed whereas in B. verrucosa chaetiger 2 projects more than surrounding chaetigers. One specimen (MNHN 186) has long, pale tubular epibionts; others contain oocytes. Bradabyssa mammillata also resembles B. elinae by having a single series of larger globular tubercles per segment; however, they differ because B. mammillata has a stiff, wider body, whereas B. elinae is thinner and softer, and because in B. mammillata the anchylose, aristate neurospines have very short rings, whereas in B. elinae they are medium-sized. Wehe & Fiege (2002: 48) stated that there was no type locality indicated for this species; however, the type locality was indicated in the original publication (Grube 1877 a: 69). The records for the Arabian of Persian Gulf by Wesenberg-Lund (1949: 334 – 335), or from Japan by Imajima (1964: 246 – 247, Figs. 33 – 38), are questionable.
distribution
Distribution. Antarctic Ocean and nearby localities, in moderate to abyssal depths.
materials_examined
Type material. Southern Indian Ocean. Kerguelen Islands. One syntype (MNHW 264), Successful Bay, (Kerguelen Islands in Grube 1877 b: 511), R. V. Gazelle, Schleinitz or Buchholz, coll. (damaged, most larger papillae eroded, body wall ventrally broken by chaetigers 5 – 8; 50 mm long, 6.5 mm wide, cephalic cage 4 mm long, 31 chaetigers). Four syntypes (ZMB 688), complete, Whale Bay, R. V. Gazelle, Schleinitz or Buchholz coll. (10 – 67 mm long, 4.5 – 10.0 mm wide, cephalic cage 2 – 5 mm long, 27 – 30 chaetigers). Two syntypes (ZMB 689), off Mount Campbell, R. V. Gazelle, Schleinitz or Buchholz coll. (complete syntype 51 mm long, 8 mm wide, cephalic cage 3 mm long, 29 chaetigers; tubercles large, rounded, arranged in 3 transverse series, anterior ones closer to each other, median series with larger tubercles; larger dorsal tubercles arranged in 4 longitudinal series; ventral papillae much smaller, arranged in 5 transverse series with alternating papillae in successive rows). Additional material. Southern Indian Ocean. Kerguelen Islands. Three specimens (MNHN 186), complete, 16 – 18 Jan. 1909, Rallier du Baty, coll. (50 – 70 mm long, 7.5 – 12.0 mm wide, cephalic cage 6 – 7 mm long, 28 – 30 chaetigers). Three specimens (MNHN 186 a), complete, R. V. Curieuse, C- 22, 1914, Rallier du Baty & Soranchet, coll. (one mature female with anterior end exposed; 42.0 – 67.5 mm long, 7.5 – 12.0 mm wide, cephalic cage 4 – 6 mm long, 30 chaetigers; oocytes 150 – 200 µm). Five specimens (MNHN- 354), only one juvenile complete, with anterior end exposed, Morbihan Bay, 25 Sep. 1951, P. Paulian, coll. (22 mm long, 5 mm wide, cephalic cage 3 mm long, 26 chaetigers). Two specimens (USNM 4828), R. V. Challenger, Sta. 149, Betsy Cove, 46 – 55 m (most larger tubercles eroded; one with a longitudinal dissection and most viscerae removed; not dissected specimen 67 mm long, 10 mm wide, cephalic cage 1 mm long, 28 chaetigers; gonopodial lobes in chaetiger 5). Antarctica. One specimen (USNM 56658), damaged, USNS Eltanin, Bransfield Strait, Sta. 432 (62 ° 52 ' S, 59 ° 27 ' W), 935 – 884 m, 7 Jan, 1963 (60 mm long, 6 mm wide, cephalic cage 3 mm long, 30 chaetigers; gonopodial lobes in chaetiger 5). One specimen (USNM 56664), damaged, off South Orkney Island, USNS Eltanin, Sta. 1078 (61 ° 27 ' S, 41 ° 55 ' W), 604 m, 12 Apr. 1964. One specimen (LACM 9550), off South Orkney Island, USNS Eltanin, Sta. 1079 (61 ° 26 ' S, 41 ° 55 ' W → 61 ° 24 ' S, 41 ° 55 ' W), 593 – 598 m, 13 Apr. 1964. Two specimens (USNM 56665), off South Orkney Island, USNS Eltanin, Sta. 1079 (61 ° 26 ' S, 41 ° 55 ' W), 593 – 598 m, 13 Apr. 1964 (43 – 101 mm long, 8 – 11 mm wide, cephalic cage 3 mm long, 31 – 35 chaetigers; gonopodial lobes in chaetiger 5).