{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T20:41:20Z","timestamp":1740170480914,"version":"3.37.3"},"reference-count":64,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2022,4,14]],"date-time":"2022-04-14T00:00:00Z","timestamp":1649894400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Fauna Ib\u00e9rica research project Polychaeta VII, Palpata, Canalipalpata II","award":["PGC2018-095851-B-C64"],"award-info":[{"award-number":["PGC2018-095851-B-C64"]}]},{"name":"Ministerio de Econom\u00eda Industria y Competitividad, Spain"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p><jats:italic>Eunice woodwardi<\/jats:italic>Baird, 1869, originally described from the R\u00eda de A Coru\u00f1a (NW Iberian Peninsula), has been overlooked and never reported from the Atlantic coast of Spain after original description and the subsequent redescription of the holotype. In the present study, we revised comparatively the holotype, newly collected specimens of this species and specimens identified as <jats:italic>Eunice vittata<\/jats:italic> (Delle Chiaje, 1829) from western Mediterranean Sea. The validity of <jats:italic>E. woodwardi<\/jats:italic> is supported and previous descriptions are complemented after a throughout study of the external morphology by means of light compound microscopy and scanning electron microscopy, and that of the internal anatomy by histological sectioning and micro-computed tomography. The presence of eyes, nuchal organs, dorsal and ventral ciliary organs on parapodial cirri and paired nephridia in most segments is confirmed in <jats:italic>E. woodwardi<\/jats:italic>; the digestive tract is clearly regionalized and divided into pharynx, oesophagus, stomach, fore, mid- and hind intestine. The presence of <jats:italic>E. woodwardi<\/jats:italic> in the R\u00eda de Ferrol is also reported, and we suggest that previous records of <jats:italic>E. vittata<\/jats:italic> in NW Iberian Peninsula should be reviewed. <jats:italic>Eunice woodwardi<\/jats:italic> is distinguished by a set of characters such as having non-articulated and non-constricted cephalic appendages, the maxillary formula, the range of branchial distribution, maximum number of branchial filaments, number of limbate and compound falciger chaetae per parapodium, the presence of an apical mucro in the guard of falciger chaetae blades and the number of teeth in pectinate chaetae. Epibiont Ciliophora on branchiae are also reported.<\/jats:p>","DOI":"10.7717\/peerj.13126","type":"journal-article","created":{"date-parts":[[2022,4,14]],"date-time":"2022-04-14T08:56:12Z","timestamp":1649926572000},"page":"e13126","source":"Crossref","is-referenced-by-count":1,"title":["Long forgotten: <i>Eunice woodwardi<\/i> Baird, 1869 (Annelida, Eunicidae) revisited, with an insight on internal anatomy"],"prefix":"10.7717","volume":"10","author":[{"given":"Mar\u00eda","family":"Barroso","sequence":"first","affiliation":[{"name":"Departamento de Biolox\u00eda, Universidade da Coru\u00f1a, A Coru\u00f1a, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1374-2033","authenticated-orcid":true,"given":"Juan","family":"Moreira","sequence":"additional","affiliation":[{"name":"Departamento de Biolog\u00eda (Zoolog\u00eda) & Centro de Investigaci\u00f3n en Biodiversidad y Cambio Global (CIBC-UAM), Universidad Aut\u00f3noma de Madrid, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julio","family":"Parapar","sequence":"additional","affiliation":[{"name":"Departamento de Biolox\u00eda, Universidade da Coru\u00f1a, A Coru\u00f1a, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"4443","published-online":{"date-parts":[[2022,4,14]]},"reference":[{"key":"10.7717\/peerj.13126\/ref-1","first-page":"113","article-title":"The use of the SkyScan 1172 high-resolution micro-CT to elucidate if the spicules of the sea slugs (Mollusca: Nudibranchia, Opisthobranchia) have a structural or a defensive function","volume":"2011","author":"Alba-Tercedor","year":"2011","journal-title":"SkyScan Users Meeting"},{"issue":"2","key":"10.7717\/peerj.13126\/ref-2","doi-asserted-by":"publisher","first-page":"265","DOI":"10.1111\/zoj12168","article-title":"The tag-along friendship: epibiotic protozoans and syllid polychaetes. 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