Bradabyssa verrucosa (Chamberlin, 1919)

Salazar-Vallejo, Sergio I., 2017, Revision of Brada Stimpson, 1853, and Bradabyssa Hartman, 1967 (Annelida, Flabelligeridae), Zootaxa 4343 (1), pp. 1-98: 60-61

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Bradabyssa verrucosa (Chamberlin, 1919)

n. comb.

Bradabyssa verrucosa (Chamberlin, 1919)   n. comb.

Figure 30 View FIGURE 30

Brada verrucosa Chamberlin, 1919: 399   –400, Pl. 68, Figs 3–6 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 .—Fauchald 1972: 217.

Type material. Eastern Pacific Ocean. Western Mexico. Holotype of Brada verrucosa   ( USNM 19341 View Materials ), three paratypes ( USNM 19342 View Materials ), and five paratypes ( MCZ 2373 View Materials , labelled as syntypes, but Chamberlin handwritten tag records them as paratypes), R.V. Albatross, Tropical Pacific Expedition, Sta. 3417 (16°32' N, 99°48' W), 902 m, 11 April 1891 (three complete paratypes ( USNM 19342 View Materials ) 42–60 mm long, 4.0– 5.5 mm wide, no cephalic chaetae, 52–53 chaetigers; complete paratypes ( MCZ 2373 View Materials ) 32.5–65.0 mm long, 3.7–6.0 mm wide, no cephalic chaetae, 49–52 chaetigers). GoogleMaps  

Additional material. Gulf of California. One specimen ( LACM 9551 View Materials ), broken into two, damaged, probably fixed in alcohol, anteroventrally dissected, mouth of Gulf of California, Sta. P 91-59 (23°54.7' N, 108°09.5' W → 23°53.6’ N, 108°08.1’ W), 723–741 m, R.H. Parker, coll. (55 (15+40) mm long, 5 mm wide, cephalic cage 18 mm long, 46 (8+38) chaetigers). Two specimens ( UNAM 7891 View Materials ), one complete, R.V. El Puma, Cruise Talud V, Sta. 3 (21°59' N, 106°29' W), modified Karling Dredge, 732 m, 13 Dec. 2000 (complete 47 mm long, 3 mm wide, cephalic cage 8 mm long, 49 chaetigers; larger specimen 70 mm long, 6 mm wide, cephalic cage 15 mm long, 25 chaetigers; gonopodial lobes in chaetiger 5). GoogleMaps  

Description. Holotype of Brada verrucosa   ( USNM 19341) complete, partly dehydrated; some paratypes better preserved; holotype ( Fig. 30C View FIGURE 30 ) body dark brown, cylindrical, tapered, posteriorly swollen; 74 mm long, 6.5 mm wide, cephalic cage chaetae broken, 50 chaetigers. Tunic papillated, tubercles alternate in size and position, mostly large, thick, slightly compressed ( Fig. 30A, C View FIGURE 30 ), capitate, covered by sediment, arranged in 3–4 transverse series. Posterior segments with transverse series of large tubercles.

Anterior end not modified; holotype not dissected, observed in a non-type specimen (MNHN 186a). One with anterior end exposed. Cephalic hood reduced, covered by branchial plate. Prostomium low pale cone, without eyes. Caruncle elongated, separating branchial plate into two lateral groups ( Fig. 30B View FIGURE 30 ). Palps short, palp keels rounded, well developed. Lips damaged during dissection.

Branchiae sessile on branchial plate, cirriform, about 100 filaments per side. Nephridial lobes positioned ventrolaterally to branchial plate.

Cephalic cage chaetae missing in most specimens ( LACM 9551 with very long chaetae; over three times longer than body width). Only chaetiger 1 involved in cephalic cage (in LACM 9551 first 3 chaetigers with long chaetae over three times longer than body width); chaetae arranged in short dorsolateral series, 3–5 chaetae per ramus.

Anterior dorsal margin of first chaetiger papillated, papillae tiny. Chaetigers 1–3 of similar length; second parapodia largest (parapodial lobes projected in several specimens); third parapodia smaller. Chaetal transition from cephalic cage to body chaetae abrupt; aristate neurospines present from chaetiger 2. Gonopodial lobes in chaetiger 5 ( Fig. 30C View FIGURE 30 ).

Parapodia abraded in holotype, apparently poorly developed, short conical lobes; one paratype with some parapodia slightly damaged ( Fig. 30D View FIGURE 30 ), notopodia well developed, chaetae emerge between two bottle-shaped papillae, one prechaetal, one postchaetal. Second parapodia largest, third smaller. In paratypes parapodia lateral; median neuropodia ventrolateral. Notopodia and neuropodia close to each other. Notopodia slightly developed; neuropodia much larger than notopodia, most papillae eroded.

Median notochaetae arranged in tufts, all multiarticulate capillaries, short articles basally, medium-sized medially, long distally ( Fig. 30E View FIGURE 30 ); 2–3 notochaetae per fascicle, as long as 1/3 body width. Neurochaetae thicker, all missing in holotype, but bases arranged in horizontal C-shaped pattern, 5–7 per bundle, in posterior chaetigers in Èshaped pattern. Few aristate spines in some paratypes, aristae mostly lost, few remain ( Fig. 30D View FIGURE 30 , inset).

Posterior region tapered, posterior end swollen, pygidium blunt conical, anus dorso-terminal, anal cirri absent.

Remarks. Bradabyssa verrucosa (Chamberlin, 1919)   n. comb. belongs in the group of species having dorsal papillae of two markedly different sizes; it differs from other species in the group because there are only 3–4 series of dorsal tubercles per segment and its larger tubercles are distinct, often covered by pigmented sediment particles.

Chamberlin (1919, Pl. 68, Figs. 3–6 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 ) inverted the labels for the figures so what he indicated as a neurochaeta (his Fig. 4 View FIGURE 4 ) is a notochaeta, and what he indicated as notochaeta (his Fig. 5 View FIGURE 5 ) corresponds to a neurochaeta.

Fauchald (1972:217) stated that there were no notopodia in the last 10–15 chaetigers, and that papillae were soft, not hard, as originally described. However, the holotype has both notopodia and notochaetae almost to the end of body; up to chaetiger 48 there is only a broken basis of a single chaeta. Furthermore, papillae are covered by a thick layer of fine sediment, rendering it hard, but this sediment breaks off easily and papillae are soft.

The Gulf of California specimen ( LACM 9551) is remarkable in several aspects. It has very long chaetae in chaetigers 1–3 and its body is very soft. It may have been fixed with ethanol, because the larger dorsal papillae are dehydrated and some even have a median fracture, transverse to the body axis. The long chaetae may be related to reproduction although epitoky or swarming behavior has not been documented for any species in the genus.

Distribution. Eastern Pacific Ocean, Gulf of California and off western Mexico, in about 1000 m water depth.


Smithsonian Institution, National Museum of Natural History


Natural History Museum of Los Angeles County














Bradabyssa verrucosa (Chamberlin, 1919)

Salazar-Vallejo, Sergio I. 2017

Brada verrucosa

Chamberlin 1919: 399