Nephtys cf. paradoxa Malm, 1874

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

Nephtys cf. paradoxa Malm, 1874 Fig. 2E

Diagnosis.

Body stout, wider anteriorly and tapering from middle chaetigers to posterior. Prostomium subrectangular, eyes not visible, pharynx when everted with ten pairs of terminal bifid papillae, and 22 rows of subterminal papillae (rows with 4-6 similar conical papillae) extending only one third of pharyngeal length, median dorsal and ventral papillae not elongated, proximal region smooth. Antennae and palps conical, short, nuchal organs conspicuous, rounded. Parapodia biramous with well-separated rami. Interramal branchiae present, somewhat recurved, from chaetiger 11, becoming foliaceous from ~ chaetiger 16 and appearing membranous from chaetiger 14-16, ciliated and fully developed with membranous expansions (or 'foliaceous lamellae’) ~ chaetiger 20, becoming small and rudimentary from ~ chaetiger 38 to posterior chaetigers. Acicular lobes obliquely rounded, notopodia with rudimentary preacicular and low postacicular lobes; neuropodia with rudimentary preacicular lobe, postacicular lamella longer than acicular lobe. Chaetae short and ‘spiky’, of three kinds: barred chaetae in preacicular position, spinulose chaetae in postacicular position and capillary chaetae present in neuropodia of chaetiger 1.

Remarks.

This species has previously been recorded from off the east Australian coast by Paxton (1974), collected in 1912 from 860 m, and has also been collected from 200 m northeast of Coffs Harbour, NSW in 1993 (unpublished AM records). However, it is a deep-water species widely distributed in the Arctic, the northern Atlantic Ocean, the Mediterranean Sea and the Pacific Ocean ( Ravara et al. 2010a), originally described from the North Sea. It is surmised that it may be a species complex and that examination of global material as well as molecular analyses can only resolve its taxonomic status ( Ravara et al. 2010b). Therefore, this is a tentative identification.

Records.

2 specimens Suppl. material 1: ops. 80, 101 (AM).

Figures

Figure 2. Acoetidae, Chrysopetalidae, Nephtyidae, Oweniidae A Acoetidae, Panthalis sp., dorsal view (AM W. 50321) B Chrysopetalidae, Dysponetus cf. caecus, dorsal view C Dysponetus cf. caecus, ventral view D Nephtyidae, Aglaophamus sp. pre- and post-acicular chaetae E Nephtyidae, Nephtys cf. paradoxa (AM W. 52750) F Nephtyidae, Aglaophamus sp. G Oweniidae, Myriowenia sp. in tube (AM W. 51842). Scale bars: 2 mm (A); 1 mm (B, C); 50 µm (D); 5 mm (E, G); 3 mm (F).