Laetmonice yarramba Hutchings & McRae, 1993

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 yarramba Hutchings & McRae, 1993 Fig. 6D, E

Diagnosis.

Specimens dorsally with debris entangled in felted notochaetae, sometimes obscuring elytra, but dorsal felt not covering elytra, elytra 12-15 pairs. Prostomium with short ocular peduncles, eye pigment absent; facial tubercle well-developed, papillate; nuchal flaps absent. Palps extending to segments 13 and 14, margins finely papillate. Median antenna with ceratophore half length of prostomium; antennal style long thin,> 3 × length of prostomium. Notochaetae of three kinds: golden, curved, smooth, acicular chaetae arched over dorsum; stout, long harpoon chaetae with three recurved fangs below tips, shafts tuberculate on some specimens; tuft of fine mud-covered chaetae ventrally. Neurochaetae in two tiers: superior tier of 2-4 yellow acicular chaetae with basal spur and subdistal fringe of hairs, inferior tier with numerous yellow bipinnate chaetae. Ventrum with small papillae present, or may be absent.

Remarks.

Specimens range from 0.2 mm to 7 cm in length. Some individuals are badly damaged, with chaetae missing, and other intact specimens show some morphological variability from the original description by Hutchings and McRae (1993) in the longer palps, and some with fewer than 13 pairs of elytra. However, they most resemble L. yarramba , but share some similarities with L. producta Grube, 1877 (which is also considered to be species complex by Hutchings and McRae 1993), such as tuberculate shafts of the harpoon chaetae, but from which it can be distinguished by the fewer pairs of elytra and the absence of nuchal flaps on the prostomium. Widespread around Australia in depths of 60-3950 m, including records from the GAB ( MacIntosh et al. 2018: additional file 2).

Records.

354 specimens. Suppl. material 1: ops. 4, 13, 15, 22, 23, 30, 31, 32, 33, 35, 42, 43, 44, 53, 56, 65, 70, 86, 115 (AM). 4 specimens. Suppl. material 1: op. 4 (MV).

Figures

Figure 6. Aphroditidae A Aphrodita cf. talpa (NMV F. 293294) dorsal view B Aphrodita cf. talpa (AM W. 49509) lateral view C Aphrodita goolmarris (AM W. 52604) dorsal view D Laetmonice yarramba dorsal view (AM W. 49499) E Laetmonice yarramba ventral view (AM W. 49500). Scale bars: 1 mm (C); 5 mm (A, B, D, E).