Eunoe cf. abyssorum (McIntosh, 1885)

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

Eunoe cf. abyssorum (McIntosh, 1885) Fig. 22D

Diagnosis.

Short-bodied, 35-40 segments, 15 pairs of elytra. Elytra pale, with minute conical microtubercles around edges and on posterior half, margins without papillae or fimbriae. Prostomium (violet-coloured when newly preserved, but fading in ethanol) with small cephalic peaks. Eyes absent from most specimens, a few with small subdermal ones. Palps long, smooth. Short lateral antennae ventrally attached (sensu Barnich and Fiege 2009, 2010), bases not touching; median antenna dorsal to lateral antennae, with large ceratophore, inserted in anterodorsal notch. Tentacular segment with notochaetae. Dorsal cirri styles long, some small, sparse papillae present. Parapodia biramous, notopodia and neuropodia both with elongate prechaetal acicular lobes, neuropodial one with supra-acicular digitiform lobe papilla-like, and rounded postchaetal lobe. Notochaetae stout, thicker (but shorter) than neurochaetae; notochaetae with blunt tips and many distinct subdistal rows of spines. Neurochaetal falcigers with long unidentate tips and subdistal rows of short spines.

Remarks.

The type locality for Eunoe abyssorum McIntosh, 1885 is the GAB, from 4750 m depth. The only other records are by Benham (1921) as ' Harmothoe abyssorum ' (three specimens from the Southern Ocean, south of Australia, in 650 m depth), Benham (1927) from Commonwealth Bay, Antarctica, in 82-91 m, and Knox and Cameron (1998) from McMurdo Sound, Antarctica. However, the descriptions by these authors of this species are inconsistent and may not be of the same species as McIntosh’s.

Eunoe includes 46 accepted species, of which at least 8 are known from southern Australia, New Zealand and adjacent regions of the Southern Ocean ( Read and Fauchald 2020). Many species are incompletely known due to inconsistent descriptions; thus our species identifications are qualified pending a revision of the genus.

Records.

9 specimens. Suppl. material 1: ops. 6, 22, 30, 53 (AM).

Figures

Figure 22. Polynoidae A Admetella cf. longipedata anterior end, dorsal view (AM W. 51461) B Austrolaenilla sp. anterior end, dorsal view (AM W. 52215) C Bathyeliasona nigra anterior end, dorsal view (AM W. 52216) D Eunoe cf. abyssorum anterior end, dorsal view (AM W. 51463) E Eunoe cf. opalina dorsal view and elytra (AM W. 51464). Scale bars: 1 mm (A, D, E); 3 mm (B); 2 mm (C).