Eunoe oerstedi (Barnich, Ruth & Fiege, Dieter 2010)
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Barnich2010Zootaxa2525, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Barnich2010Zootaxa2525">{{Citation |
Ordo: Phyllodocida
Familia: Polynoidae
Genus: Eunoe
Name
Eunoe oerstedi Malmgren, 1866 – Wikispecies link – Pensoft Profile
- Eunoe oerstedi Barnich, Ruth, 2010, Zootaxa 2525: 8-10.
Materials Examined
Additional material.1 spm., SMF17446, "Johan Ruud" St. 476, 70 °01.43’N 30 °47.70’E, NE Atlantic, N Norway, Varangerfjord, SE Skallne, 10 May 2006, epibenthic sledge, 232 m, ded. & ded. C. d'Udekem d'Acoz. 1 spm., SMF17467, "Johan Ruud" St. 308, 70 °57.90’N 25 °27.05’E, NE Atlantic, N Norway, Magerøysundet, Risvikneset, 14 April 2005, dive, 20 m, leg. & ded. C. d'Udekem d'Acoz. 1 spm., SMF17478, "Johan Ruud" St. 298, 70 °58.73’N 25 °17.78’E, NE Atlantic, N Norway, Magerøysundet, Stikkelsvågnaeringen, 13 April 2005, dive, 20 m, leg. & ded. C. d'Udekem d'Acoz. 1 spm. (af), SMF17479, "Johan Ruud " St. 299, 70 °59.26’N 25 °19.99’E, N E Atlantic, N Norway, Magerøysundet, Stikkelsvågnaeringen, 13 April 2005, dive, 20 m, leg. & ded. C. d'Udekem d'Acoz. 1 spm. (af), SMF17481, "Johan Ruud" St. 310, 70 °59.35’N 25 °20.34’E, NE Atlantic, N Norway, Stikkelsvågnaeringen, 14 April 2005, dive, 20 m, leg. & ded. C. d'Udekem d'Acoz. 2 spms. (juv.), SMF17504, "Johan Ruud" St. 734, 69 °52.04’N, 18 °52.82’E, NE Atlantic, N Norway, Kvalsund i Kårvik, 7 October 2002, epibenthic sledge, 60 m, leg. & ded. C. d'Udekem d'Acoz. 1 spm. (juv.), SMF17513, "Johan Ruud" St. 733, 69 °52.04’N, 18 °52.82’E, NE Atlantic, N Norway, Kvalsund i Kårvik, 7 October 2002, epibenthic sledge, 60 m, leg. & ded. C. d'Udekem d'Acoz. 1 spm., SMF17514, " Jan Mayen " St. 196, 78 °52.2’N 22 °13.4’E, Arctic Ocean, Svalbard, Hinlopen, 23 September 2003, Sneli sledge, 120 m, leg. & ded. C. d'Udekem d'Acoz. 2 spms. (juv.; 1 cs, 1 af), SMF17521, " Jan Mayen " St. 196, 78 °52.2’N 22 °13.4’E, Arctic Ocean, Svalbard, Hinlopen, 23 September 2003, Sneli sledge, 120 m, leg. & ded. C. d'Udekem d'Acoz. 2 spms., SMF17527, " Jan Mayen " St. 204, 78 °40.6’N 21 °23.8’E, Arctic Ocean, Svalbard, S Hinlopen, 23 September 2003, Sneli sledge, 50 m, leg. & ded. C. d'Udekem d'Acoz. 1 spm., SMF18853, St. HP- 376, 44 ° 59.136 'N 67 ° 1.944 'W, NE Pacific, Canada, St. Andrews, Passamaquoddy Bay, silt substrate, 70 m,trawl, 7 August 2008, leg. E. Corstorphine & C. Carr, ded. C. Carr. 1 spm., SMF18860, St. HP- 386, 45 ° 0.402 'N 67 ° 2.502 'W, NE Pacific, Canada, St. Andrews, Passamaquoddy Bay, silt substrate, 10 m, trawl, 14 August 2008, leg. E. Corstorphine & C. Carr, ded. C. Carr. 1 spm. (cs), SMF18895, "G.O. Sars" St. 2669, 71 °14.90’N 26 °56.02’E, NE Atlantic, N Norway, 18 August 2007, 281.6 m, ded. A. Sikorski.
Diagnosis
Diagnosis. Elytra at outer lateral margin with long, at posterior margin with short papillae; microtubercles conical to cylindrical, distally simple, bifid, or multifid, becoming larger towards posterior margin; macrotubercles scattered on surface and near posterior margin, cylindrical and distally branched multifid, or spiny.
Description
Description (based on smaller specimen out of two, SMF17527). Body with 36 segments. At anterior end (Fig. 3 A), prostomium bilobed, cephalic peaks absent (small peaks might be present in other specimens); ceratophore of median antenna in anterior notch, lateral antennae inserted ventrally, styles of antennae papillate, abruptly tapering subdistally; anterior pair of eyes situated dorsolaterally at widest part of prostomium, posterior pair dorsally near hind margin of prostomium; palps distinctly papillate, tapering. Tentaculophores inserted laterally to prostomium, each with two notochaetae and a dorsal and ventral tentacular cirrus, styles of cirri papillate, abruptly tapering subdistally. Second segment with first pair of elytra, biramous parapodia, and long buccal cirri. Following segments with short, tapering, slightly papillate or smooth ventral cirri. Fifteen pairs of elytra, covering dorsum, on segments 2, 4, 5, 7, then on every second segment to 23, 26, 29, 32; last four segments cirrigerous; elytra at outer lateral margin with long, at posterior margin with short papillae; microtubercles conical to cylindrical, distally simple, bifid, or multifid, becoming larger towards posterior margin; macrotubercles scattered on surface and near posterior margin, cylindrical and distally branched multifid, or spiny (Fig. 3 B,C). Cirrigerous segments with distinct dorsal tubercles; dorsal cirri with cylindrical cirrophore, style papillate, abruptly tapering subdistally. Parapodia biramous; notopodia with elongate acicular lobe; neuropodia with elongate prechaetal acicular lobe with short, digitiform supra-acicular process; neuropodial postchaetal lobe shorter than prechaetal lobe, rounded; tips of noto- and neuroacicula penetrating epidermis (Fig. 3 D). Notochaetae stouter than neurochaetae, with distinct rows of spines and blunt tip (Fig. 3 E); neurochaetae all unidentate with distinct rows of spines, leaving rather long bare part distally, tip slightly falcate (Fig. 3 F–H). Measurements. Specimens from Svalbard (SMF17527): small specimen, cs, L 23 mm, W 6 mm (excl. chaetae) for 36 segments (Fig. 3 A–H); large specimen, cs, L 45 mm, W 12 mm (excl. chaetae) for 37 segments. Specimens of Eunoe oerstedi can get very large in Arctic waters as is the case for E. nodosa. A rather large specimen found by D. Eibye-Jacobsen (pers. comm.) in Arctic Canada reached a length of 63 mm and a width of 22 mm (excl. chaetae). According to Pettibone (1963) specimens can grow even larger: length up to 80 mm, width 30 mm (incl. chaetae) for up to 42 segments.
Discussion
Remarks.Eunoe nodosa and E. oerstedi have often been confused in the past (see also Pettibone 1954), but they differ in the shape and distribution of their elytral tubercles (Figs. 2 B–D, 3 B–C). In E. nodosa microtubercles are mostly low, semi-globose, and with nodular papillae distally; macrotubercles occur in a row near the posterior margin, they are usually conical to cylindrical, and show nodular papillae distally. In E. oerstedi, however, macrotubercles are scattered on the surface and near the posterior margin, they are all distally branched multifid or spiny; microtubercles are much more erect than in E. nodosa, being conical to cylindrical and distally simple, bifid, or multifid. At first glance Eunoe oerstedi and Acanthicolepis zibrowii n. sp. (see below) might be confused, since they show some similarities in their elytra. But they differ clearly in two important generic characters, i.e. the number of pairs of elytra and the shape of the tip in the neurochaetae: E. oerstedi has 15 pairs of elytra and neurochaetae with exclusively unidentate tip, while A. zibrowii n. sp. has 18 pairs and mainly bidentate neurochaetae with stout secondary tooth and only some unidentate neurochaetae.
Distribution
Distribution and habitat. Arctic Ocean, North Atlantic and North Pacific; from shallow waters to 940 m (see Pettibone 1963).
Taxon Treatment
- Barnich, Ruth; Fiege, Dieter; 2010: On the distinction of Harmothoe globifera (G. O. Sars, 1873) and some other easily confused polynoids in the NE Atlantic, with the description of a new species of Acanthicolepis Norman in McIntosh, 1900 (Polychaeta, Polynoidae), Zootaxa 2525: 8-10. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
