Laonice cf. blakei Sikorski & Jirkov in Sikorski, Jirkov and Tzetlin 1988

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

Laonice cf. blakei Sikorski & Jirkov in Sikorski, Jirkov and Tzetlin 1988 Fig. 31F

Diagnosis.

Specimens all anterior fragments, almost all in very poor condition, usually very short, only two specimens with> 20 chaetigers. Prostomium bell-shaped, anteriorly broadly rounded; small cirriform occipital tentacle present at posterior end; eyes absent. Nuchal organ if discernible with yellow pigment, extending to ~ chaetiger 8 in best preserved specimens. Peristomium moderately developed and not fused to prostomium. Branchiae from chaetiger 2, cirriform, separate from dorsal lamellae (mostly lost in present material). Interparapodial pouches present from between chaetigers 3 and 4. Parapodial lamellae broad, particularly foliaceous in notopodia of the anterior mid-body. Capillaries arranged in two or three rows in anterior notopodia, in neuropodia in two rows. Sabre chaetae first present from chaetigers 10-13, appearing first as up to five capillaries in inferiormost position, in hook-bearing chaetigers usually as one or two stout granulated chaetae. Hooded hooks first observed in neuropodia of chaetigers 17-19, numerous (numbering 15), with four apical teeth above main fang; in notopodia hooks absent. Dorsal crests not observed. Pygidium unknown.

Remarks.

The morphology of specimens examined is in accordance with diagnostic characters for L. blakei . Important characters are the start of interparapodial pouches between chaetigers 3 and 4, prostomium not fused to the peristomium, the start of sabre chaetae not before chaetigers 10, and of neuropodial multidentate hooded hooks from about chaetigers 20. However, most of the specimens from IN2017_V03 were in very poor condition and not all diagnostic characters could be observed in each specimen. Laonice blakei is known from deep waters of the Atlantic Ocean and Nordic Seas but has not been reported before from Australian waters or the Pacific Ocean in general. Considering this we refer to our specimens as L. cf. blakei .

Records.

11 specimens. Suppl. material 1: ops. 9, 31, 33, 42, 55, 76, 79 (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).