Eunoe cf. opalina 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. opalina McIntosh, 1885 Fig. 22E

Diagnosis.

Specimens with 38-42 segments. Elytra 15 pairs, far posterior part not covered by elytra, present on 2, 4, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 26, 29, 32; margins with short fine papillae, also longer ones present internally on posterior section, microtubercles cylindrical with truncated flattened tips and few larger macrotubercles (soft, globular and bell-shaped) with similar truncated tips. Some faint small brown pigment spots on prostomium and dorsum. Prostomium ovate, wider than long. Cephalic peaks present, two pairs of eyes with anterior pair laterally at widest part of prostomium, posterior pair lateral, but closer together than anterior pair. Lateral antennae inserted ventrally, bases separate, antennal styles papillate and longer than prostomial width. Tentaculophores with notochaetae present, styles papillated. Dorsal cirri papillated. Noto- and neuropodia with elongate acicular lobes, supra-acicular digitiform process present on neuropodia. Aciculae penetrating epidermis. Notochaetae all spinous, with many rows of spines right up to the blunt tip, neurochaetae thinner with fine spinous rows, all unidentate with bare falcigerous tips. Notochaetal fascicles held erect dorsally but not orientated over dorsum.

Remarks.

These specimens most resemble Eunoe opalina McIntosh, 1885, because of the combination of unidentate neurochaetae, the form of spination of noto- and neurochaetae, presence of papillae on lateral antennae, presence of notochaetae on tentaculophores, and the forms of elytral ornamentation (papillae, small microtubercles and a few larger soft globular macrotubercles). However, because there are some differences to previous descriptions of Eunoe opalina (e.g., presence of papillae on dorsal cirri and presence of chaetae on tentaculophores), the identification remains tentative. Eunoe opalina has previously been recorded from the Southern Ocean at depths of 100-500 m.

Records.

2 specimens. Suppl. material 1: ops. 6, 22 (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).