Melinna cf. armandi 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

Melinna cf. armandi McIntosh, 1885 Fig. 4D, d

Diagnosis.

No complete specimens, large, robust worm> 30 mm length, 5 mm width. Abdominal segments very badly preserved and/or missing on all specimens. Body long, widest in postbranchial region. Thorax with 18 chaetigers; neurochaetae as small acicular spines on first four chaetigers and uncini on remaining 14 chaetigers. Prostomium with well-defined anterior and posterior parts, separated by a pair of deep transverse nuchal that almost meeting mid-dorsally. Anterior part distally trilobed. No eyespots. Many smooth buccal tentacles. Chaetiger 1 collar-like, laterally and ventrally encompassing head region; anterior margin not crenulated. Branchiae in two basally fused groups of four. Inner and anterior most branchia of each group only fused at base. Branchiae all long, circular in cross section, tapering evenly to narrow tips. Postbranchial hooks (Fig. 4d ) with sharply pointed and gently curved tips. Dorsal end of neurochaetal row on chaetiger 1-3 on elevated lobe. Chaetiger 3 with a few notochaetal capillaries. Chaetiger 4 with small, but well developed notopodia. Serrated brim/fold behind the hooks (dorsal membrane) with ~ 14 equally sized lanceolate projections.

Remarks.

Melinna armandi was originally described from west of North Island, New Zealand. Specimens here have 14 lanceolate projections on transverse dorsal membrane whereas M. armandi have eight.

Records.

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

Figures

Figure 4. Ampharetidae and Melinnidae. Ampharetidae A Amage sp. nov. 1 B Anobothrus sp. nov. 1, anterior end methyl blue staining C Anobothrus sp. nov. 2 anterior end methyl blue staining. Melinnidae D Melinna cf. armandi and tube (AM W. 50354), d dorsal hook. Ampharetidae E Amphicteis sp. (AM W. 50429). Melinnidae F Melinnopsis gardelli anterior dorsal view (AM W. 50735) G Melinnopsis sp. nov., lateral view (AM W. 50397). Scale bars: 2 mm (A); 1 mm (B, C); 2.5 mm (D); 1 cm (E, G); 1 mm (F).