Sabellidae gen. sp. 2

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

Sabellidae gen. sp. 2 Fig. 26B

Diagnosis.

One small gravid specimen, body 0.8 mm long including crown, damaged by poor preservation (plus one half branchial crown without a body). Eight thoracic chaetigers, and seven abdominal chaetigers, 3 (4?) pairs radioles with long pinnules. Branchial crown membrane present, dorsal lip with radiolar appendage, dorsal pinnular appendages present, ventral pinnular appendages present. Anterior peristomial ring dorsally exposed, posterior ring somewhat developed into a higher ventral lobe, with wide mid-dorsal gap. Glandular ridge present on chaetiger 2. Paleate thoracic chaetae apparently absent in segments where chaetae still intact, narrowly-hooded chaetae present (bayonet chaetae not seen). Thoracic uncini acicular, with long curved handles and rows of teeth (sizes not determinable) above main fang. Abdominal uncini avicular with rows of teeth above main fang, breast square or rectangular, handles absent. Posterior anal depression and flanges all absent.

Remarks.

This specimen displays some features of the genus Chone such as the number of radiole pairs, presence of branchial membrane and pinnular appendages, collar lobation, and the form of the uncini. However, the diagnostic paleate thoracic chaetae are apparently lacking, thus, this is a tentative identification, and may be due to the poor condition and size of the specimen. Specimen was stained with methyl blue and photographed to show staining pattern. Further specimens are required for confirmation.

Records.

1 specimen. Suppl. material 1: op. 42 (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).