Prionospio cf. amarsupiata Neal & Altamira in Paterson, Neal, Altamira, Soto, Smith, Menot, Billett, Cunha, Marchais-Laguionie and Glover 2016

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

Prionospio cf. amarsupiata Neal & Altamira in Paterson, Neal, Altamira, Soto, Smith, Menot, Billett, Cunha, Marchais-Laguionie and Glover 2016 Fig. 31C

Diagnosis.

Prostomium longer than wide, inverse bottle-shaped, slightly rounded anteriorly, elongated posteriorly into short caruncle extending to the end of chaetiger 1, prostomium without appendages. Eyes absent. Peristomium moderately developed and separated from first chaetiger; with yellow pigment lateral to the caruncle as semi-circular ridges (possibly position of nuchal organs). Branchiae mostly lost but scars of lost branchiae seem apparent on chaetigers 2-4, potentially also chaetigers 5 with branchial scars; branchiae on chaetigers 3 and 4 cirriform, shorter than notopodial lamellae and not fused to it. Interparapodial pouches not observed. Notopodial lamellae on chaetigers 1-5 lanceolate, small on chaetigers 1, afterwards increasing in size until chaetiger 4, smaller again on chaetigers 5, largest usually on chaetigers 3 and 4. Neuropodial lamellae small and rounded on first chaetiger, from chaetiger 2 semi-circular, in hook-bearing chaetigers reduced in size and not well preserved in examined material. Chaetae of three types: capillaries, hooded hooks, sabre chaetae. Anterior chaetae until chaetiger 18-20 all capillaries with thin sheaths, in notopodia arranged in up to three rows, in two rows in neuropodia. From chaetiger 18-20 stout granulated sabre chaetae in inferior position. From chaetigers 19 or 20 capillaries without sheaths, and neuropodial hooks; hooks long-shafted, hooded, stout, with ~ seven apical teeth above main fang, sometimes appearing acicular with distally bent tip. Notopodial hooks not present in examined material (all anterior fragments of fewer than 30 chaetigers).

Remarks.

We refer to our specimens as P. cf. amarsupiata since branchial scars on chaetigers 2-5 seem to be present. Specimens with long branchiae on 2nd and 5th chaetigers, as shown in the original description, could not be found.

Records.

4 specimens. Suppl. material 1: ops. 23, 33, 54, 66 (AM).

Figures

Figure 31. Spionidae A Aurospio cf. dibranchiata: anterior end, dorsal view (AM W. 52242) B Aurospio sp. nov. 1, anterior end, dorsal view (AM W. 52240) C Prionospio cf. amarsupiata, anterior end, dorsal view (AM W. 52221) D Dipolydora notialis, heavy spine with crest of bristles on convex side from chaetiger 5 (AM W. 52245) E Dipolydora notialis, bidentate hooded hooks with smooth, curved shafts without constriction from posterior chaetiger (AM W. 52245) F Laonice cf. blakei: anterior end, dorsal-oblique view (AM W. 52226) G Spiophanes anoculata, posteriorly incomplete specimen in dorsal-oblique view, metameric dorsal ciliated organ bordered by pigment of dark orange or ochre colour (AM W. 52222). Scale bars: 100 µm (A, B, C); 1 µm (D, E); 200 µm (F); 500 µm (G).