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).