Leitoscoloplos cf. abranchiatus (Hartman, 1967a)

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

Leitoscoloplos cf. abranchiatus (Hartman, 1967a) Fig. 18B

Diagnosis.

All specimens incomplete posteriorly. Longest fragment ~ 15 mm long, 1.3 mm wide, consisting of 41 chaetigerous segments. Thorax slightly flattened, abdomen cylindrical. Prostomium conical; one peristomial ring. Eleven thoracic chaetigers. Abdominal parapodia lateral in anterior abdomen, shifted dorsally on posteriorward segments. Branchiae from chaetiger 24, first short triangle, then becoming longer, strap-like. Thoracic postchaetal lobes conical in both rami; short in anterior thorax, becoming longer in middle and posterior parts; notopodial lobes longer. No subpodial or stomach papillae. Abdominal notopodia digitiform, same length as branchiae or shorter; abdominal neuropodia weakly bilobed, with short round lobes, inner slightly larger. Subpodial flange not developed, no flange papillae. All chaetae crenulated capillaries; forked chaetae not observed, probably broken. Colour in ethanol whitish-brown, with pigment spots on prostomium and in intersegmental furrows, or completely white.

Remarks.

Leitoscoloplos abranchiatus was described as entirely lacking branchiae, but all specimens studied were posteriorly incomplete ( Hartman 1967a; Mackie 1987; Blake 2017). Specimens described here resemble L. abranchiatus by the number of thoracic chaetigers, shape of thoracic postchaetal lobes, shape and more lateral than dorsal position of abdominal parapodia.

Records.

4 specimens. Suppl. material 1: ops. 9, 16, 54 (AM).

Figures

Figure 18. Orbiniidae A Berkeleyia sp. (op. 79) B Leitoscoloplos cf. abranchiatus (op. 54) C Leitoscoloplos cf. kerguelensis (op. 96) D Leitoscoloplos sp. 1 (op. 30) E Orbiniella cf. aciculata (op. 42) F Protoaricinae gen. sp. (op 100). Scale bars: 500 µm (A, C, E); 2 mm (B, D); 1 mm (F).