Petta williamsonae Zhang, Hutchings & Kupriyanova, 2019

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

Petta williamsonae Zhang, Hutchings & Kupriyanova, 2019 Fig. 20D, E

Diagnosis.

Cephalic veil completely free from operculum, with smooth or bearing several lappets (slightly raised mounds) anterior margin. Operculum semi-circular with smooth dorsal and lateral margins. Ventral margin of operculum with a transverse row of numerous stout notopodial paleae on each side. Two pairs of comb-like branchiae on segments 3 and 4, consisting of large basal hump and series of well separated free lamellae. Pair of dorso-lateral pads on segment 5. Ventro-lateral lobes smooth on segment 3. Notopodia with paleae on segment 1 and with notochaetae on segments 5-21 (17 pairs). Neuropodia present on segments 8-21,> 14 pairs with transverse tori, each with a row of uncini. Scaphe distinctly separated from posterior segments.

Remarks.

Type locality is Bass Strait, eastern Australia, 2760-2692 m.

Records.

2 specimens. Suppl. material 1: op. 22 (AM).

Figures

Figure 20. Pectinariidae Petta investigatoris (AM W. 50672) A ventral view B dorsal view C tube. Petta williamsonae (AM W. 50667) D ventral view E anterior end, lateral view. Scale bars: 2 mm (A, B); 5 mm (C); 1 mm (D); 0.5 mm (E).