Orbiniella spinosa Blake, 2017, new species ...

• Main Author: Blake, James A.
• Format: Text
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Orbiniidae; Orbiniella; Orbiniella spinosa; Argentina; Pacific; Southern Ocean; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.5281/zenodo.4901827; https://zenodo.org/doi/10.5281/zenodo.4901827

Orbiniella spinosa new species Figure 54 D–G Material examined. Off Argentina, 38°46′S, 55°20′W, on drifting Macrocystis holdfasts, coll. J.M. Orensanz (holotype, USNM 1013688). Description. A small species, holotype 2.1 mm long, 0.2 mm wide, for 22 setigerous segments. Body not divided into distinct regions; posterior parapodia not dorsally elevated; body cylindrical throughout, individual setigerous segments narrower than long, similar throughout, posterior most segments more flattened dorsoventrally. Setal changes mainly with neurosetae anterior to posterior. Branchiae entirely absent. Pygidium with two blunt lobes, without anal cirri (Fig. 54 D). Color in alcohol light tan. Prostomium elongate, rounded on anterior margin (Fig. 54 D), eyespots absent; nuchal organs extending from posterior margin of prostomium, under first peristomial annulation. Peristomium about 1.3x as long as prostomium with two achaetous rings, each of same size, with lateral annulae not cutting across dorsum (Fig. 54 D). Parapodia ... : Published as part of Blake, James A., 2017, Polychaeta Orbiniidae from Antarctica, the Southern Ocean, the Abyssal Pacific Ocean, and off South America, pp. 1-145 in Zootaxa 4218 (1) on page 113, DOI: 10.5281/zenodo.245827 ...