title: Two new species and a remarkable record of the genusDendronotusfrom the North Pacific and Arctic oceans (Nudibranchia).
abstract: Two new species of the nudibranch genusDendronotus,Dendronotus arcticussp. n.andDendronotus robilliardisp. n., are described from the Arctic and North Pacific oceans respectively, based on morphological and molecular data, and the North PacificDendronotus albusis revealed to be a species complex. The speciesDendronotus robilliardisp. n.is described from the northwestern Pacific (Kamchatka) differing from the northeastern PacificDendronotus albusby molecular and morphological data. The synonymy ofDendronotus diversicolorwithDendronotus albusis confirmed by analysis of their original descriptions. An endemic Arctic speciesDendronotus arcticussp. n.is also described here, differing substantially from all species of the genusDendronotususing morphological and molecular data. An unusual record of the recently describedDendronotus kamchaticusEkimova, Korshunova, Schepetov, Neretina, Sanamyan, Martynov, 2015 is also presented, the first from the northeastern Pacific, geographically separated from the type locality of this species in the northwestern Pacific by a distanceca.6000 km; molecular data show them to belong to the same species.
authors.affiliation: Koltzov Institute of Developmental Biology RAS, Vavilova Str. 26, 119334 Moscow, Russia; Zoological Museum, Moscow State University, Bolshaya Nikitskaya Str. 6, 125009 Moscow, Russia.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Korshunova
authors.affiliation: Branch of Pacific Geographical Institute FEB RAS, Partizanskaya Str. 6, 683000 Petropavlovsk-Kamchatsky Russia.
authors.forename: Nadezhda
authors.initials: N
authors.lastname: Sanamyan
authors.affiliation: Murmansk Marine Biological Institute, Vladimirskaya Str.17, 183010 Murmansk, Russia.
authors.forename: Olga
authors.initials: O
authors.lastname: Zimina
authors.affiliation: Port Orchard 98366, Washington, USA.
authors.forename: Karin
authors.initials: K
authors.lastname: Fletcher
authors.affiliation: Zoological Museum, Moscow State University, Bolshaya Nikitskaya Str. 6, 125009 Moscow, Russia.
authors.forename: Alexander
authors.initials: A
authors.lastname: Martynov
keywords: Arctic Ocean; Dendronotus; North Pacific Ocean; Nudibranchia; molecular phylogeny; new species; taxonomy