Bruunilla undetermined

Bonifácio, Paulo & Menot, Lénaïck, 2019, New genera and species from the Equatorial Pacific provide phylogenetic insights into deep-sea Polynoidae (Annelida), Zoological Journal of the Linnean Society 185, pp. 555-635 : 597

BRUUNILLA SP. 692

( FIG. 11H, TABLES 1, 2)

Material examined: MNHN-IA-PNT 72 ( IFR692 ), complete, length 3.16 mm, width 0.55 mm, segment count not possible because of poor condition, Equatorial Eastern Pacific Ocean , Clarion-Clipperton Fracture Zone, APEI#3 , station 197, collected 22 April 2015, epibenthic sledge epi-net, start 18°48.659′N, 128°22.753′W, end 18°49.088′N, 128°21.289′W, 4805– 4823 m depth, 2529 m trawling distance .

Description: Complete, 3.16 mm long and 0.55 mm wide, dorsoventrally flattened; colour of live animal not known; ethanol-preserved specimen pale yellow; poor condition, most chaetae and parapodia missing ( Fig. 11H).

Prostomium bilobed, wider than long, lobes not pronounced, anteriorly rounded; with ovoid frontal filaments; median notch between prostomial lobes narrow and shallow ( Fig. 11H); eyes absent. Median antenna present, lateral antennae absent; ceratophore of median antenna bulbous, very short (shorter than anterior end of frontal filaments), inserted near posterior margin of prostomium, style smooth, tapering, long. Palps missing. A pair of wing-like structures on ventral side (left one broken), like a prolongation of lower lip, separated longitudinally until segment 3; each lobe oval, blunt, with mostly longitudinal folds anteriorly and posteriorly, partly covering at least four segments.

Tentacular segment with a pair of short lobes, inserted laterally and slightly below prostomium; tentaculophores small, equal sized; styles missing. Pharynx dissected with pharyngeal papillae not possible to count; two pairs of jaws, each with main fang and serrated margins (18–22 teeth); gradually bigger distally. Second segment with elytrophores, subbiramous parapodia, with chaetae and ventral cirri.

Cirrigerous segments with small dorsal cirrophores; styles missing; dorsal tubercles absent.

Ventral cirri present from segment 2 to last segment; inserted basally on neuropodia of segment 2, style smooth, tapering, long (much longer than tip of neuroacicular lobe); missing in subsequent segments.

Parapodia subbiramous, notopodia reduced, much shorter than neuropodia. Notopodia reduced, subtriangular, tapering into long acicular lobe, tip of notoacicula not penetrating epidermis. Neuropodia large, rectangular to subtriangular, tapering into long acicular lobe, tip of neuroacicula not penetrating epidermis; cirriform neuropodial papillae not seen on segments 11–14.

Notochaetae missing. Neurochaetae long to short, with distal parts flattened to concave, serrated along both margins, with pointed to blunt tips.

Nephridial papillae not seen. Pygidium rounded, with dorsal anus.

R e m a rk s: T h e s p e c i m e n wa s t o o d a m a g e d t o be described formally as a new species but was successfully sequenced for COI, 16S and 18S.

Genetic data: DNA sequencing for this specimen was successful for COI, 16S and 18S.

Distribution: Only one specimen was sampled at a single station within the Clarion-Clipperton Fracture Zone in APEI#3 area.