Cenogenus, Gunton & Kupriyanova & Alvestad & Avery & Blake & Biriukova & Böggemann & Borisova & Budaeva & Burghardt & Capa & Georgieva & Glasby & Hsueh & Hutchings & Jimi & Kongsrud & Langeneck & Meißner & Murray & Nikolic & Paxton & Ramos & Schulze & Sobczyk & Watson & Wiklund & Wilson & Zhadan & Zhang, 2021

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

Cenogenus sp. nov. Fig. 13A, B, C

Diagnosis.

Body width: 1-2 mm. Prostomium conical, elongated, shorter than peristomium. Nuchal antenna not observed. All parapodia well developed, first four pairs of parapodia smaller than remaining parapodia. Parapodia with inconspicuous prechaetal and postchaetal lobes equal in size. Anterior parapodia with simple digitate elongate (length to width ratio near 2:3) branchia attached dorsally and posteriorly to parapodial lobes, in middle parapodia branchiae decrease in length becoming more rounded.

Anterior parapodia with long fragile limbate chaetae only, middle parapodia with limbate chaetae and simple multidentate hooded hooks with six to seven small teeth and long blade. All chaetae dark, black or dark brown in colour, becoming translucent near tip. Acicula dark, two in median parapodia.

Maxillary apparatus dark, stout, with four pairs of maxillae. Maxillary carriers shorter than MI. MI forceps-like with attachment lamellae, without connecting plates. MII as long as MI, with two large teeth. MIII unidentate, completely pigmented, dark in colour. MIV large, unidentate round-square plates, completely pigmented.

Remarks.

The specimen AM W.50137 (op. 33, Suppl. material 1) differs from others by being smaller (width 1 mm, other three specimens near 2 mm wide) and having asymmetrical MII with three teeth on left MII and two teeth on right MII.

Records.

4 specimens. Suppl. material 1: ops. 30, 33, 53 (AM).

Figures

Figure 13. Lumbrineridae A Cenogenus sp. nov. (AM W. 50139), parapodium from chaetiger 7 B Cenogenus sp. nov., posterior parapodium C Cenogenus sp. nov., maxillae D Eranno sp. nov., AM W. 50140, parapodium from chaetiger 11 E Eranno sp. nov., maxillae F Lumbrineris sp., op. 4 (NHMUK), anterior part of the body, dorsal view G Lumbrineris sp., simple hooded hooks. Abbreviations: Mc, maxillary carriers; MI-MIV, maxillary plates. Scale bars: 200 µm (A, B, D); 500 µm (C, E); 5 mm (F); 25 µm (G).