Dysponetus cf. caecus (Langerhans, 1880)

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

Dysponetus cf. caecus (Langerhans, 1880) Fig. 2B, C

Diagnosis.

Prostomium truncate, with three short antennae and two short palps. No eyes. Large mouth cirrus and pair of rod-like stylets. Two pairs of cirriform tentacular cirri on segments 1 and 2; segments one and two fused; dorsal cirri segment 1 very long, notopodia 2 with notochaetae. Mid-body notopodia with two lengths of semi-erect, golden-coloured notochaetal fascicles: short, broad and long, slender, spines with two rows of spinelets; elongate cirrophores and long dorsal styles. Neuropodia with fascicle of very slender falcigerous neurochaetae with very long shafts; ventral cirri longer than neuropodia.

Remarks.

Similar to, but differs from abyssal East Atlantic Dysponetus cf. caecus (sensu Böggemann 2009; Watson et al. 2014) in possession of broad short spines with less spinulation. Dysponetus caecus is currently considered a global species complex.

Records.

48 specimens. Suppl. material 1: ops. 11, 23, 40, 76, 98, 110, 134 (AM). 2 specimens. Suppl. material 1: op. 100 (NHMUK).

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).