Phalacrostemma timoharai 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

Phalacrostemma timoharai Zhang, Hutchings, Burghardt & Kupriyanova, 2020 Fig. 25C-F

Diagnosis.

Opercular lobes completely fused to each other. 18-22 pairs of outer paleae, their blades straight with ornamented thecae. Two pairs of inner opercular paleae on dorsal margin of opercular lobes, with straight cylindrical or slightly flattened blades with smooth margins. Eight pairs of robust long conical papillae around operculum. Four pairs of nuchal hooks with limbs on concave margin. Tentacular filaments absent along margins of buccal cavity. Pair of buccal flaps present. One pair of palps similar in length to operculum. Thoracic segment 1 with two (or one) pair of neuropodial cirri. Thoracic segment 2 (chaetiger 2) with one pair of triangular lateral lobes. Nine pairs of dorsal branchiae on chaetigers 2-10. Four parathoracic chaetigers (3-6) bearing notopodia with robust and retractile lanceolate chaetae interspersed with capillaries and neuropodia with fine lanceolate chaetae interspersed with fine capillaries. Cauda smooth, anal appendages absent.

Remarks.

Type locality is Coral Sea MP, eastern Australia, 1013-1093 m. Phalacrostemma timoharai is characterized by having 18-22 pairs of outer paleae, two pairs of neuropodial cirri on thoracic segment 1 and one pair of lateral lobes on thoracic segment 2.

Records.

4 specimens. Suppl. material 1: ops. 104, 121 (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).