Laetmonice benthaliana McIntosh, 1885

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

Laetmonice benthaliana McIntosh, 1885

Diagnosis.

Body shape elongate,> twice as long as maximum width. Number of chaetigers 33-34. Dorsal felt of fine notochaetae absent. Fifteen pairs of elytra, elytral surface smooth. Elytra comments: some inconspicuous brown pigmented spots in the middle. Prostomium rounded, facial tubercle large and visible dorsally. Facial tubercle papillate. Eye pigmentation absent. Eyes located on elongate ocular peduncles, longer than wide. Median antenna bi-articulate with basal ceratophore and elongate style. Median antenna ceratophore length ~ as long as prostomium. Median antenna ceratostyle length much longer than prostomium (3-6 × as long). Palp surface smooth, palps extending to segment 15. Ventrum with sparse cover of papillae, appearing almost smooth. Ventral cirri of mid-body chaetigers short, not reaching base of neurochaetae. Dorsal notochaetae harpoon-like, with several barb-like tips. Harpoon notochaetae (stout with barbed tips) present. Harpoon notochaetae shaft with fine granulations. Prominent basal spur on neurochaetae present. Spur-neurochaetae of (mid-body segments) subdistal teeth absent. Spur-neurochaetae subdistal hairs present. Marginal hairs not reaching the tip of the spur but leaving a significant basal gap.

Remarks.

In this study the species was recorded from 2751-2820 m; other records from the Australian region include RV 'Dmitry Mendeleev’ voyage 16 stations 1372 and 1373 in the GAB (700-1976 m) by Averincev (1978) and RV ‘Galathea’ stations 601, 697 in the Tasman Sea (3580-4400 m) by Kirkegaard (1995).

Records.

4 specimens. Suppl. material 1: op. 4 (MV).