Orbiniella undetermined

• Main Authors: Meca, Miguel A., Kongsrud, Jon Anders, Kongshavn, Katrine, Alvestad, Tom, Meißner, Karin, Budaeva, Nataliya
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2024
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Orbiniida; Orbiniidae; Orbiniella; Orbiniella undetermined; Arctic; Norwegian Sea
• Online Access: https://doi.org/10.5281/zenodo.12190936; http://treatment.plazi.org/id/98986F42B188522FA71F13DBA7D0CF67

Orbiniella sp. Figs 14, 15, 16 Orbiniella petersenae : Parapar et al. 2015: 333–343, figs 3–9 (in part). Clade. Deep 4. Material examined. ZMBN 130943 (1 spm); ZMBN 157696 (1 spm on SEM stub); ZMBN 157665 (5 spms); ZMBN 157666 (2 spms on SEM stub); ZMBN 157667 (1 spm on SEM stub, DNA voucher Orbi 47). 16 specimens from the O. petersenae sensu lato type series: IINH 43198 (5 spms). IINH 43231 (11 spms). Description of ethanol preserved specimens. DNA voucher Orbi 47 (ZMBN 157667) incomplete with 15 chaetigers, 1.7 mm long and 0.3 mm wide at level of chaetiger 6. Body short and thick, with uniform width. Two more specimens from the same sample as the DNA voucher (ZMBN 130943 and ZMBN 157696) in poor condition (i. e., anterior fragments of fewer than ten segments and destroyed chaetae). Pigmentation lacking in all analysed specimens. Prostomium broad with rounded anterior margin, without eyespots (Fig. 14 A). SEM micrographs showed no cilia on prostomium. Peristomium with two prominent achaetous segments, first segment shorter than second segment, distinctly separated from each other and first chaetiger by narrow annulus (Fig. 14 B). Segmental annulation consisted of two narrow annuli between parapodia from parapodium 1 until end of available fragment (Fig. 14 A). Posterior part and pygidium not observed. Parapodia biramous, triangular-like, of similar size throughout fragment. Posterior notopodial lobes from chaetiger 1, digitate, short, and thick (Fig. 14 C). Posterior neuropodial lobes absent. Crenulated capillary chaetae and acicular spines in both rami from chaetiger 1. Capillaries in anterior segments longer than body width and numerous (7–10 per bundle), shorter and reduced in number in posterior segments. Acicular spines short, stout, and smooth, up to three per ramus (Fig. 14 C, D). Description of formalin preserved specimens. Five well preserved specimens originally fixed in formalin collected in the Norwegian Sea (ZMBN 157665) as well as 16 specimens from O. petersenae sensu lato type series from the ...