Perkinsiana sp.

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

Perkinsiana sp.

Diagnosis.

Single small incomplete specimen, only thorax and one abdominal segment remaining. Eight thoracic segments, six pairs of radioles with long pinnules, radiolar eyes absent. Basal flanges absent. Ventral lamellae present and external. First segment enlarged. Ventral shields prominent, in contact with thoracic neuropodial tori. Dorsal lips with short radiolar appendage. Thoracic inferior chaetae two rows of paleate chaetae, bayonet chaetae absent. Thoracic uncini avicular with long necks, medium-length handles and many rows of teeth above main fang. Companion chaetae present, with long, roughly symmetrical hoods. Chaetigers 7-9 with uncini and companion chaetae, spines absent. Abdominal uncini avicular with long necks and short handles, similar to thoracic uncini.

Remarks.

Specimen is poorly preserved, the collar region is damaged, and its details are unclear. The specimen conforms most to the genus Perkinsiana because of the types of chaetae and the elongation of the first segment but identification to species level is difficult due to lack of abdomen and poor preservation of collar. It is possibly the same species as the larger of two specimens recorded as ' Sabellidae sp. 3' in the 2015 GAB survey ( MacIntosh et al. 2018: additional file 2), which was examined and although also greatly damaged anteriorly, was found to possess five pairs of long radioles with long pinnules, external ventral lamellae, and thoracic paleate chaetae, long-handled avicular uncini and companion chaetae similar to the specimen described herein.

Records.

1 specimen. Suppl. material 1: op.101 (AM).