Brada kudenovi, Salazar-Vallejo, 2017

Salazar-Vallejo, Sergio I., 2017, Revision of Brada Stimpson, 1853, and Bradabyssa Hartman, 1967 (Annelida, Flabelligeridae), Zootaxa 4343 (1), pp. 1-98 : 18-20

Brada kudenovi n. sp.

Figure 7

Brada inhabilis .—von Marenzeller 1892: 427, Pl. 19, Fig. 6 (non Rathke, 1843).

Type material. Bering Sea, Aleutian Islands. Holotype ( CAS 157753), NMFS Aleutian Survey 2000, R.V. Vesteraalen, Haul 110 (51.56° N, 176.76° W), 168 m, 18 Jun. 2000, E.J. Kools, coll. One paratype ( CAS 157752), most chaetae broken, NMFS Aleutian Survey 2000, R.V. Vesteraalen, Haul 111 (51.60° N, 177.21° W), 213 m, 18 Jun. 2000, E.J. Kools, coll. (26 mm long, 6.5 mm wide, 26 chaetigers; gonopodial lobes in chaetiger 4, eroded; 13–14 series of papillae in chaetiger 10; dissected for anterior end features). One paratype ( CAS 158548), without chaetae, NMFS Aleutian Survey 2000, R.V. Vesteraalen, Haul 88 (51.48° N, 173.93° W), 257 m, 14 Jun. 2000, E.J. Kools, coll. (23 mm long, 7 mm wide, 26 chaetigers; gonopodial lobes in chaetiger 4, eroded; 13–14 series of papillae in chaetiger 10; body with abundant black medium-sized sediment grains). One paratype ( CAS 158549), without chaetae, NMFS Aleutian Survey 2000, R.V. Vesteraalen, Haul 109 (51.60° N, 176.60° W), 143 m, 18 Jun. 2000, E.J. Kools, coll. (15.5 mm long, 4.5 mm wide, 25 chaetigers; gonopodial lobes in chaetiger 4, eroded; 13–14 series of papillae in chaetiger 10; dissected for anterior end features).

Additional material. Arctic Ocean, Canada. One specimen ( USNM 1422403), complete, most chaetae broken, R.V. Resolute, Banks Islands, Prince of Wales Strait, Sta. 1103 (72º53' N, 118º01' W), 26 m, mud, otter trawl, 4 Jul. 1962, E.H. Grangier, coll. (30 mm long, 9 mm wide, cephalic cage broken, 21 chaetigers).

Description. Holotype whitish, most chaetae broken. Body fusiform, short, thick, almost smooth ( Fig. 7A ); 20 mm long, 4 mm wide, cephalic cage chaetae broken, 25 chaetigers.

Papillae very small, globose ( Fig. 7B ), arranged in alternating transverse series, dorsally with 13–14 series per segment, ventrally smaller, 18–20 per segment; all papillae covered by thin layer of fine sediment particles and some dispersed larger dark sediment grains, especially towards the posterior end.

Anterior end not exposed, observed in paratype (CAS 158549). Prostomium low, pale, with four diffusely pigmented black eyes. Caruncle well developed, not reaching the branchial plate posterior margin. Palps very thick, pale, deep ciliated furrow. Palp keels rounded, low. Lateral lips well developed, thick, pale. Ventral lip reduced. Dorsal lip triangular, directed ventrally ( Fig. 7C ).

Branchiae all thick, cirriform, sessile on branchial plate, arranged in a posterior row barely separated middorsally in two lateral groups, each with 4 filaments. Branchiae as long as palps. Nephridial lobes present on inner bases of second branchiae from below.

Cephalic cage chaetae broken. Anterior dorsal margin of first chaetiger papillated, triangular, directed ventrally. Anterior chaetigers without especially long papillae. Chaetigers 1–3 decreasing insize posteriorly. Chaetal transition from cephalic cage chaetae to body chaetae abrupt; falcate neurospines present from chaetiger 2. Gonopodial lobes pale, present in chaetiger 4.

Parapodial poorly developed; median neuropodia ventrolateral. Notopodia and neuropodia close to each other. Notopodia inconspicuous, surrounded by rounded short, often blunt papillae. Neuropodia small truncate elliptical lobes, surrounded by 1–2 series of small papillae ( Fig. 7D, E ).

Notochaetae restricted to one per ramus; all notochaetae multiarticulate capillaries, articles alternating long and short basally, long medially and distally ( Fig. 7F ), 1–2 notochaetae per ramus, each notochaetae as long as 1/10 body width. Falcate neurospines present from chaetiger 2, arranged in short transverse series ( Fig. 7G ), mostly broken, 4–6 per ramus. Each neurospine with medium-sized anchylose articles basally and medially, distally hyaline.

Posterior end blunt, rounded; pygidium with anus ventroterminal, vertical slit, with large lateral lobes, anal cirri absent.

Variation. Adult specimens 15.5–26.0 mm long, 4.5–6.5 mm wide, 25–26 chaetigers.

Etymology. This species is named after Dr Jerry Kudenov, in recognition of his many contributions to polychaete systematics, which were very useful for my studies on the Gulf of California polychaetes.

Remarks. Brada kudenovi n. sp. closely resembles B. inhabilis ( Rathke, 1843) by having a fusiform body with abundant short papillae. However in B. kudenovi n. sp. the body is whitish with 25–26 chaetigers, the neuropodial lobes are low, non-projecting, and there are only 1–2 notochaetae per bundle, whereas in B. inhabilis , the body is tan with 20–23 chaetigers, neuropodial lobes are projecting, and there are 3–4 notochaetae per bundle. The previous records by Støp-Bowitz (1948a:42), as well as those of B. inhabilis by Pettibone (1954:292–293, Fig. 33h ), or by Ushakov (1955:311/1965:289, Fig. 115I) for ‘ Brada’ nuda for the Northwestern Pacific Ocean, may all correspond to this newly described species.

Distribution. Bering Sea, in subtidal depths (143–257 m).

Figures

FIGURE 6. Brada inhabilis (Rathke, 1843), smaller, non-type specimen (ZMUB 34537). A. Right lateral view. B. Anterior end, lateral view (arrow points to gonopodial papilla). C. Head, frontal view (palps and branchiae removed; Br: branchial scar, PS: palp scar). D. Median parapodium (greenish after methyl-green staining). E. Anterior parapodium notochaetae (inset: enlargement of notochaeta). F. Posterior parapodium, two neurochaetae (insets: neurochaetal tips). Scale bars: A: 2.1 mm, B: 1.3 mm, C: 0.4 mm, D: 0.3 mm, E: 75 µm, F: 120 µm.

FIGURE 7. Brada kudenovi n. sp. A. Holotype (CAS 157753), oblique ventral view. B. Same, anterior end (arrow points gonopodial papilla). C. Paratype (CAS 158549), head, frontal view, greenish after methyl-green staining (palps and branchiae removed; Br: branchial scar, PS: palp scar). D. Holotype (CAS 157753), anterior parapodia, chaetigers 4 – 7 (anterior end to the right), oblique ventral view. E. Paratype (CAS 157752), chaetiger 11, right parapodium, anterior view. F. Same, basal, medial and distal notochaetal regions. G. Same, neurochaetae (inset: chaetal tips). Scale bars: A: 2.7 mm, B: 1 mm, C: 0.2 mm, D: 0.5 mm, E: 0.3 mm, F: 50 µm, G: 30 µm.

FIGURE 33. Bradabyssa hartmanae n. sp.: A. Holotype (SIORAS 866), dorsal view. B. Same, anterior end, dorsal view. C. Paratype (ECOSUR 185), prostomium with branchiae and palps removed, frontal view (1 – 4: branchial scars, PS: palp scar). D. Holotype, anterior end, ventral view. E. Paratype (ECOSUR 185), chaetiger 6, left parapodium, anterior view (No: distal notochaetal region, Ne: neurochaetal tip). Scale bars: A: 1 mm, B: 0.25 mm, C: 0.1 mm, D: 0.27 mm, E: 150 µm.