Gesaia csiro Zhang, Hutchings, Burghardt & Kupriyanova, 2020

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

Gesaia csiro Zhang, Hutchings, Burghardt & Kupriyanova, 2020 Fig. 25A, B

Diagnosis.

Operculum completely divided into two elongate free lobes. Twenty-two pairs of outer paleae, their blades with frayed thecae and rolled inward tips. Two pairs of inner opercular paleae on dorsal margin of opercular lobes, with straight cylindrical blades with smooth margins. Six pairs of long conical papillae spirally arranged around opercular lobes. One pair of nuchal hooks without limbation. Three pairs of tentacular filaments along margins of buccal cavity. Buccal flaps absent. One pair of long palps extending beyond operculum. Thoracic segment 1 with neuropodial cirri. Thoracic segment 2 with one pair of triangular lateral lobe. Eleven pairs of dorsal branchiae on chaetigers 2-12. Four parathoracic chaetigers (3-6) bearing notopodia with robust lanceolate chaetae interspersed with fine capillaries and neuropodia bearing thin lanceolate chaetae interspersed with fine capillaries. Cauda long and smooth with three pairs of anal appendages.

Remarks.

Type locality is Central Eastern MP, eastern Australia, 4414-4436 m. The genus Gesaia is recorded from eastern Australian waters for the first time. Seven specimens of Gesaia sp. 1 were recorded from three stations in the GAB (932-1836 m) ( MacIntosh et al. 2018: additional file 2), molecular data are needed to confirm if the species in this study are the same as from the GAB.

Records.

208 specimens. Suppl. material 1: ops. 88, 89, 128 (AM).

Figures

Figure 25. Sabellariidae A Gesaia csiro holotype (AM W. 49506), anterior end with tube B G. csiro, entire body, lateral view C Phalacrostemma timoharai holotype (AM W. 50674), ventro-lateral view D P. timoharai, lateral view E P. timoharai, tube F P. timoharai, entire body in tube, lateral view. Scale bars: 1 mm (A, B, E, F); 0.5 mm (C, D).