Neanthes heteroculata ( Hartmann-Schroeder , 1981)

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

Neanthes heteroculata ( Hartmann-Schroeder, 1981) Fig. 15B

Diagnosis.

Prostomium slightly wider than long, one anterior pair of very large eyes and one very small pair posteriorly. Jaws with dentate cutting edge, translucent yellow to brown with six teeth. Maxillary ring of pharynx with paragnaths as follows: Area I absent; II absent; III absent; IV 1-3 conical paragnaths; V absent; VI 2 conical paragnaths; VII-VIII 7 conical paragnaths in a ventral band.

Longest tentacular cirri extend back to chaetiger 6. Dorsal notopodial ligule of posterior chaetigers similar to those on anterior chaetigers. Prechaetal notopodial lobe present; smaller than dorsal notopodial ligule on anterior chaetigers, reduced and ultimately absent posteriorly. Acicular process absent. Dorsal cirrus basally attached throughout, ~ 1 × acicular notopodial ligule at chaetiger 10-20. Neuropodial prechaetal and postchaetal lobes absent. Ventral neuropodial ligule of anterior chaetigers present, ~ as long as acicular neuropodial ligule throughout.

Notoaciculae absent from segments 1 and 2. Notopodial homogomph spinigers present. Neurochaetae: dorsal fascicle heterogomph spinigers absent. Neuropodial dorsal fascicle homogomph spinigers present. Neuropodial dorsal fascicle with heterogomph falcigers and homogomph falcigers on anterior chaetigers present. Neurochaetae, ventral fascicle: homogomph spinigers; ventral fascicle heterogomph falcigers.

Remarks.

Although previously only known from the type material in the North Atlantic, Bay of Biscay, 4700 m, the present material from 3980-4280 m is indistinguishable on morphological characters. This is the first record from Australia and the first record since the original description.

Records.

4 specimens. Suppl. material 1: ops. 54, 65, 78 (NHMUK).

Figures

Figure 15. Nereididae A Neanthes cricognatha (op. 80) B Neanthes heteroculata, prostomium C Neanthes sp. 1, live specimen D Neanthes sp. 1, prostomium E Neanthes sp. 2, live specimen F Neanthes sp. 2, prostomium G Nereis sp. 1 H Nereis sp. 1, prostomium. Scale bars: 5 mm (A); 1 mm (B, D, F); 10 mm (C, E); 5 mm (G); 0.5 mm (H).