Orbiniella parapari Meca, Kongsrud, Kongshavn, Alvestad, Meißner, and Budaeva 2024
- Dataset
- Diversity of Orbiniella (Orbiniidae, Annelida) in the North Atlantic and the Arctic
- Rank
- SPECIES
- Published in
- Meca, Miguel A., Kongsrud, Jon Anders, Kongshavn, Katrine, Alvestad, Tom, Meißner, Karin, Budaeva, Nataliya (2024): Diversity of Orbiniella (Orbiniidae, Annelida) in the North Atlantic and the Arctic. ZooKeys 1205: 51-88, DOI: 10.3897/zookeys.1205.120300
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- order
- Orbiniida
- family
- Orbiniidae
- genus
- Orbiniella
- species
- Orbiniella parapari
description
Description (based on type specimens). Holotype complete with 29 chaetigers, 4.3 mm long and 0.5 mm wide at level of chaetiger 6. Body short and thick, uniformly wide, narrowing in preanal area. Pigmentation lacking. Prostomium broad with rounded anterior margin, without eyespots (Fig. 9 A). Peristomium with two prominent achaetous segments, first peristomial segment shorter than second, distinctly separated from each other and first chaetiger by narrow annulus (Fig. 9 A). No conspicuous nuchal organs observed. Anterior segments short, becoming longer, more square-shaped from chaetiger 8 onwards. Segmental annulation of following pattern: one narrow annulus between parapodia from parapodium 1 until 5 or 6, two narrow annuli between parapodia from parapodium 5 or 6 until 10 – 14, and three narrow annuli between parapodia from parapodium 10 – 14 until pygidium (Fig. 10 A, B). Segmental annulation less defined in pre-pygidial region. Parapodia biramous, wider than long (Fig. 9 C), with postchaetal notopodial lobe digitate, short, and thick from chaetiger 1. Postchaetal neuropodial lobe absent. Crenulated capillary chaetae and acicular spines present in both rami from chaetiger 1. Capillaries in anterior segments longer than body width and numerous (7 – 10 per bundle), in posterior segments shorter and reduced in number. Acicular spines long, thin, and smooth, up to six per ramus (Fig. 9 E). Last five or six posterior segments slightly shorter and last two achaetous (Fig. 10 C). Pygidium with four short and thick anal lobes (Fig. 10 D).
description
Figs 8, 9, 10
diagnosis
Diagnosis. An Orbiniella with segmental annulation pattern as follows: one narrow annulus between parapodia from parapodium 1 until 5 or 6, two narrow annuli between parapodia from parapodium 5 or 6 until 10 – 14, and three narrow annuli between parapodia from parapodium 10 – 14 until pygidium. Acicular spines long and thin, up to six in both noto- and neuropodia. Pygidium with four short and thick anal lobes.
distribution
Distribution. Iceland Sea and Norwegian Sea, 1811 – 2832 m (Fig. 8).
etymology
Etymology. This species is dedicated to the Spanish polychaetologist Dr. Julio Parapar, who described the first Orbiniella species in the North Atlantic waters, Orbiniella petersenae Parapar, Moreira & Helgason, 2015.