Exogone cf. heterosetosa 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

Exogone cf. heterosetosa McIntosh, 1885 Fig. 26E

Diagnosis.

Specimen incomplete, 3 mm long, 0.25 mm wide for 29 segments. Palps fused for full length, curled ventrally. Two pairs eyes. Three antennae, median antenna longer than combined length of prostomium and palps, lateral antennae shorter than palps. Proventricle through 3-4 chaetigers. Single pair of papillae-like tentacular cirri; dorsal cirri similar to tentacular cirri, slightly longer, absent on chaetiger 2. Parapodia uniramous with compound chaetae and a single dorsal simple chaeta per parapodium from chaetiger 1; compound chaetae mostly short-bladed heterogomph bidentate falcigers with secondary tooth larger than distal one, and short marginal spines, plus a single spiniger-like compound chaeta per parapodium, shafts distally spinose, blades elongate, enlarged basally (triangular) and tapering to fine indistinctly bidentate tips; single aciculum per parapodium, distally rounded.

Remarks.

This specimen most resembles E. heterosetosa McIntosh, 1885, according to the original description and the subsequent redescription by San Martin (2005) and comments by Barroso et al. (2017), but differs from it by the more elongate, basally-expanded blades of the spiniger-like compound chaetae. The known distribution of E. heterosetosa is subantarctic seas, and it has been recorded from Australian coasts from shallow waters <600 m depth according to San Martin (2005).

Records.

1 specimen. Suppl. material 1: op. 40 (AM).

Figures

Figure 26. Sabellidae, Syllidae, Terebellidae. Sabellidae A Sabellidae sp. 1 (AM W. 52133) B Sabellidae sp. 2 (AM W. 52214) C Potamethus cf. scotiae (AM W. 51585). Syllidae D Anguillosyllis sp. (AM W. 52625) E Exogone cf. heterosetosa (AM W. 52329) F Terebellidae (sensu stricto) (AM W. 50426). Scale bars: 1 mm (A, B, D, E); 5 mm (C, F).