Bradabyssa harrisae, 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 : 64-65

publication ID

https://doi.org/ 10.11646/zootaxa.4343.1.1

publication LSID

lsid:zoobank.org:pub:6E46EE12-D51F-48B0-BC66-0EBBAF9FA981

DOI

https://doi.org/10.5281/zenodo.6051179

persistent identifier

https://treatment.plazi.org/id/038B87B6-3459-FFEC-1AB7-FCADFCDAF867

treatment provided by

Plazi

scientific name

Bradabyssa harrisae
status

sp. nov.

Bradabyssa harrisae n. sp.

Figure 32 View FIGURE 32

Type material. Northeastern Atlantic Ocean. Norway. Holotype ( LACM 9552 View Materials ), Hardangerfjorden (60°10'00" N, 06°00'00" E), Sta. H 08-62, 126– 186 m, 22 Oct. 1958 GoogleMaps . One paratype ( LACM 9553 View Materials ), Hardangerfjorden (60°10'00" N, 06°00'00" E), Sta. near Z-106, 12 Nov. 1958 (no further data) (15 mm long, 2 mm wide, cephalic cage 1.5 mm long, 35 chaetigers; dorsal papillae long, filiform, of similar size, with abundant fine sand, forming 4–5 series per segment, without gonopodial lobes). GoogleMaps

Additional material. Northeastern Atlantic Ocean. Norway. An anterior fragment ( LACM 9554 View Materials ), Hardangerfjorden (60°10'00" N, 06°00'00" E), Sta. Z 05-65, 195 GoogleMaps 135 m, 18 Oct. 1965 (no further data) (23 mm long, 4 mm wide, cephalic cage 3 mm long, 30 chaetigers; dorsal papillae long, filiform, with abundant sand grains in base and stem, 5–6 series per segment, nephridial lobe in chaetiger 5). A posterior fragment ( LACM 9555 View Materials ), Hardangerfjorden (60°10'00" N, 06°00'00" E), Sta. 83-58, 126 GoogleMaps 186 m, 22 Oct. 1958 (no further data) (posterior chaetigers with large sand particles; pygidium with middorsal rounded lobe and radial muscular lobes, slightly incrusted with fine sediment grains). One specimen ( USNM 1073357 View Materials ), broken in two, posterior region damaged, Vanvikan (66º33'33" N, 10º12'14" E), Trondheim Fjord, 18 Feb. 2003, F. Pleijel, coll. (12 mm long, 2 mm wide, cephalic cage 1.5 mm long, 30 chaetigers; 6 transverse series of papillae in chaetiger 10; gonopodial lobes pale in chaetiger 5). Sweden. Two complete specimens ( LACM 9556 View Materials ), Tjarno, L.H. Harris, coll. (14.5–17.0 mm long, 1.7–2.5 mm wide, cephalic cage 1.8–2.0 mm long, 36–38 chaetigers; gonopodial lobes in chaetiger 5). GoogleMaps

Description. Holotype (LACM 9552) complete, mature female; body pale, slightly fusiform, anteriorly blunt, tapered posteriorly, posterior region regenerated ( Fig. 32A View FIGURE 32 ); 33 mm long, 4 mm wide, cephalic cage 3 mm long, 38 chaetigers. Tunic papillated; papillae long, basally covered with fine sand grains, papillae tips free from sediment. Papillae larger dorsally, shorter ventrally, in 5–6 transverse series per segment.

Anterior end exposed. Cephalic tube short, margin smooth. Prostomium low, rounded lobe, eyes not seen. Palps pale, thick, with longitudinal furrow, about twice as long as branchiae ( Fig. 32C View FIGURE 32 ); palps keels low, rounded. Caruncle separating branchiae into two lateral groups, with median keel and two lateral ridges, keel large, swollen. Dorsal lip reduced; lateral and ventral lips well developed.

Branchiae cirriform, pale, sessile on branchial plate, separated into two lateral groups, filaments arranged in several rows, up to 100 filaments per group. Nephridial lobes not seen.

Cephalic cage chaetae as long as ¾ body width. Only chaetiger 1 involved in cephalic cage; chaetae arranged in short lateral series, with 6 notochaetae and 4 neurochaetae per ramus.

Anterior margin of first chaetiger papillated, papillae long, sparse, eroded in holotype, better preserved in paratype ( Fig. 32B View FIGURE 32 ). Chaetigers 1–3 of similar length. Chaetal transition from cephalic cage to body chaetae abrupt; aristate neurospines present from chaetiger 2. Gonopodial lobes pale, digitate, in chaetiger 5 ( Fig. 33C, D View FIGURE 33 ).

Parapodia well developed, lateral. Median neuropodia ventrolateral. Notopodia and neuropodia close to each other. Notopodia with chaetal lobe rounded, with 3–4 inferior basally swollen papillae, about one-third to half as long as notochaetae ( Fig. 33E View FIGURE 33 ); neuropodia with larger rounded lobe, with 6–8 inferior, long papillae, basally swollen; notopodial lobes rounded, short.

Median notochaetae arranged in short transverse series, most notochaetae multiarticulate capillaries with articles short basally, medially medium-sized, long distally, 5–6 chaetae per bundle, as long as 1/4 body width. Neurochaetae multiarticulate capillaries in chaetiger 1; posterior chaetigers with aristate neurospines, arranged in short transverse series, 5–6 per bundle. Each neurospine with short anchylose articles basally, become shorter medially, distally hyaline with long mucro ( Fig. 33E View FIGURE 33 , inset).

Posterior region in regeneration; pygidium conical, truncate, anus terminal, anal cirri absent.

Variation. Paratype 15 mm long, 2 mm wide, cephalic cage 1.5 mm long, 35 chaetigers; other specimens 12–23 mm long, 1.7–2.5 mm wide, cephalic cage 1.5–3.0 mm long, 30–38 chaetigers.

Remarks. Bradabyssa harrisae n. sp. specimens were originally confused with B. villosa (Rathke, 1843) n. comb. (see below). They differ in the relative number of chaetigers and especially the relative number of transverse series of dorsal papillae, such that there are species that are more similar to B. harrisae n. sp. than B. villosa , as indicated in the key above. Several of these similar species possess sand particles on the dorsal papillae and bodies with 35–38 chaetigers; B. harrisae differs from all of these because it has 6–8 transverse series of papillae per segment, whereas the others have only 3–4 transverse series of papillae.

Etymology. The species is named after my good friend and teacher, Leslie H. Harris, from the Los Angeles Museum, in recognition of her enormous experience working on polychaetes and to acknowledge her and her husband’s, David Ocker, generosity towards me and several of my colleagues, and particularly as she collected some of the specimens employed for this description.

Distribution. Norway and Sweden, up to 186 m depth.

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