Eunoe sp. 3

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 sp. 3

Diagnosis.

Specimens with 25-38 segments, 15 pairs of elytra. Some brown pigment present on prostomium and spots on anterior dorsum and ventrum. Elytra with small fine papillae marginally and sub-marginally scattered on surface, conical microtubercles also present, some curved distally, macrotubercles absent. Two pairs of eyes present, sometimes not visible, anterior pair at widest part of prostomium, oriented laterally, posterior pair located more dorsally. Cephalic peaks present. Facial tubercle present. Tentaculophores with several stout curved chaetae. Lateral antennae inserted ventrally, short, approximately half as long as prostomial width, styles papillate, bases almost touching, not fused. Median antenna ceratophore large, style long, papillate. Palps long, at least as long as eight anterior chaetigers, with minute papillae in rows along length. Dorsal cirri long, 1-2 × length of parapodia with chaetae, sparsely papillate. Parapodia long, as long as body width. Notochaetal fascicles held dorsally erect, but not joining mid-dorsally. Neuropodia with preacicular elongate lobe. Notochaetae slightly thicker than neurochaetae, with numerous spinous rows along chaetae, tapering to pointed tip. Neurochaetae of two types: superior ones elongate with numerous rows of small spines alternating along length, tapering to conical (broad) unidentate tips (not hooked); inferior ones shorter, with 6-10 rows short spines starting mid-length, somewhat curved and tapering to fine pointed unidentate tips.

Remarks.

These specimens do not exactly agree with any descriptions of the 46 valid species of Eunoe , particularly most of those that have been reported from southern Australian, New Zealand and Antarctic waters, i.e., E. opalina , E. abyssorum , E. leiotentaculata Averincev, 1978, E. papillaris Averincev, 1978, E. ivantsovi Averincev, 1978, E. iphionoides McIntosh, 1885, and E. campbellica Averincev, 1978. There are differences such as long papillate palps, elytral ornamentation, and the two distinctive types of neurochaetae. The most similar species is E. etheridgei Benham, 1915, with which our specimens share features such as type of elytral ornamentation, papillate antennal and dorsal cirri styles, ornamentation of chaetae, and notochaetae thicker than neurochaetae, but which differs from descriptions of E. etheridgei by the presence of two types of neurochaetae, and the presence of small papillae on long palps. Eunoe etheridgei was recorded from Bass Strait at 360 m. Polynoinae sp. 5 from the GAB surveys in 426-1027 m depth may be the same as Eunoe sp. 3 ( MacIntosh et al. 2018: additional file 2).

Records.

31 specimens. Suppl. material 1: ops. 16, 31, 54 (AM).