Dipolydora notialis (Blake & Kudenov, 1978)

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

Dipolydora notialis (Blake & Kudenov, 1978) Fig. 31D, E

Diagnosis.

Specimens all short anterior fragments, moderately preserved. Prostomium narrow, rounded anteriorly, caruncle not well preserved in present material; occipital tentacle not observed. Chaetiger 1 with capillaries in noto- and neuropodia. Chaetiger 5 moderately modified; modified heavy spines of one type arranged in a curved row, heavy spines with bent tip and crest of bristles on convex side, arranged together with thin companion chaetae; dorsal fascicle of geniculate chaetae and of neuropodial capillaries present. Bidentate hooded hooks with smooth, curved shafts without constriction start in neuropodia of chaetiger 7. Branchiae from chaetiger 7, continuing to the end of fragments. Gizzard-like structure in anterior part of the digestive tract not very distinct.

Remarks.

The morphology of specimens examined is generally in good accordance with the original description of Polydora notialis by Blake and Kudenov (1978), now referred to Dipolydora . The number of heavy spines is greater in the here examined specimens (eight spines in one row opposed to four or five spines cited in the original description). However, this character is not regarded an important diagnostic character in the taxonomic literature dealing with this species or genus.

Records.

7 specimens. Suppl. material 1: ops. 4, 67, 70, 80, 100 (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).