title: First record of genus Orbiniella Day, 1954 (Polychaeta: Orbiniidae) in North Atlantic Ocean with the description of a new species.
abstract: A new species of the genus Orbiniella Day, 1954 (Polychaeta: Orbiniidae), collected during the BIOICE programme on sedimentary bottoms off Iceland, is described. Orbiniella petersenae sp. nov. is a shelf and slope species (107 to 1,915 m) chiefly characterized by having notopodial postchaetal papilla from first chaetiger, long crenulated capillary chaetae and several acicular chaetae on each parapodial rami, and pygidium with four lobes. External micromorphology and gross internal anatomy were studied using, respectively, SEM and micro-CT; this is the first time these techniques are used for any species in this genus. A key to all species of this genus worldwide is provided.
authors.affiliation: Departamento de Bioloxía Animal, Bioloxía Vexetal e Ecoloxía, Facultade de Ciencias, Universidade da Coruña, rúa da Fraga 10, E-15008 A Coruña, Spain.; Email: julio.parapar@udc.es.
authors.forename: Julio
authors.initials: J
authors.lastname: Parapar
authors.affiliation: Departamento de Biología (Zoología), Universidad Autónoma de Madrid, Campus de Cantoblanco, E-28049 Madrid, Spain; Email: unknown.
authors.forename: Juan
authors.initials: J
authors.lastname: Moreira
authors.affiliation: Institute of Biology, University of Iceland, Sturlugata 7, IS-101 Reykjavik, Iceland; Email: unknown.
authors.forename: Gudmundur Vidir
authors.initials: GV
authors.lastname: Helgason
mesh_terms: D000818:Animals; D001267:Atlantic Ocean; D008855:Microscopy, Electron, Scanning; D011077:Polychaeta / Q000033:anatomy & histology* / Q000145:classification* / Q000648:ultrastructure; D013045:Species Specificity; D055114:X-Ray Microtomography