Bathypolaria magnicirrata (Neal, Barnich, Wiklund & Glover, 2012)

Gunton, Laetitia M., Kupriyanova, Elena K., Alvestad, Tom, Avery, Lynda, Blake, James A., Biriukova, Olga, Boeggemann, Markus, Borisova, Polina, Budaeva, Nataliya, Burghardt, Ingo, Capa, Maria, Georgieva, Magdalena N., Glasby, Christopher J., Hsueh, Pan-Wen, Hutchings, Pat, Jimi, Naoto, Kongsrud, Jon A., Langeneck, Joachim, Meissner, Karin, Murray, Anna, Nikolic, Mark, Paxton, Hannelore, Ramos, Dino, Schulze, Anja, Sobczyk, Robert, Watson, Charlotte, Wiklund, Helena, Wilson, Robin S., Zhadan, Anna & Zhang, Jinghuai, 2021, Annelids of the eastern Australian abyss collected by the 2017 RV ' Investigator' voyage, ZooKeys 1020, pp. 1-198 : 1

Bathypolaria magnicirrata (Neal, Barnich, Wiklund & Glover, 2012)

Diagnosis.

Specimens with short bodies, 18-19 segments, nine pairs of small, reduced elytrophores (all elytra missing). Everted pharynx light brown, with seven pairs of similar-sized terminal papillae, two pairs of smooth amber-coloured jaws. Prostomium wider than long, bilobed, eyes absent, median antenna present on small cylindrical ceratophore, style long, tapering. Lateral antennae and frontal filaments absent. Long smooth palps present, inserted ventrolaterally. Tentacular segment fused to prostomium, tentaculophores achaetous, styles filiform, long, ventral style longer than dorsal style. Cirrophores on non-elytrigerous segments more prominent than elytrophores, large, cylindrical anteriorly. Parapodia biramous, elongate with notopodia almost as long as neuropodia, aciculae penetrating epidermis. Ventral cirri inserted subdistally from segment 3. Notopodia with long flattened, wide chaetae with fine serrations along one side, tips pointed, unidentate. Neurochaetae slenderer than notochaetae, flattened and with fine serrations along both sides of each chaeta. Posterior ventral keel present.

Remarks.

Austropolaria was originally described as a monotypic genus, based on A. magnicirrata described by Neal et al. (2012) from 1000-1500 m in the Amundsen Sea of the Antarctic region. These specimens agree closely with this species diagnosis including that the pharynx has seven pairs of terminal papillae, nine pairs of reduced elytrophores, large dorsal tubercles, and a posterior ventral keel.

Kolbasova et al. (2020) showed that the monotypic genus Austropolaria is a junior synonym of Bathypolaria Levenstein, 1981 so the combination of the type species Bathypolaria magnicirrata (Neal, Barnich, Wiklund & Glover, 2012) was implicit.

Records.

8 specimens. Suppl. material 1: ops. 23, 45, 110 (AM).