title: The phylogenetic position of a new species of Plakobranchus from West Papua, Indonesia (Mollusca, Opisthobranchia, Sacoglossa).
abstract: Plakobranchus papua Meyers-Muñoz & van der Velde, sp. n. from West Papua (Papua Barat province, Indonesia), is described based on its external morphology, colour pattern, internal anatomy, radula and reproductive system. In a molecular phylogenetic study specimens of this new species were compared with those of ten candidate taxa under the name Plakobranchus ocellatus van Hasselt, 1824. DNA analyses of COI mtDNA showed a clear distinction between Plakobranchus papua sp. n. and "Plakobranchus ocellatus". Plakobranchus papua, sp. n. also differed from all taxa that have been synonymised with Plakobranchus ocellatus. The genus is in dire need of taxonomic revision, preferably based on an integrative analysis involving morphology and DNA of all known Plakobranchus varieties.
authors.affiliation: Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Animal Ecology and Physiology, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: María Angélica
authors.initials: MA
authors.lastname: Meyers-Muñoz
authors.affiliation: Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Animal Ecology and Physiology, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands; Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, The Netherlands.
authors.forename: Gerard
authors.initials: G
authors.lastname: van der Velde
authors.affiliation: Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, The Netherlands; Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, United Kingdom.
authors.forename: Sancia E T
authors.initials: SE
authors.lastname: van der Meij
authors.affiliation: Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Animal Ecology and Physiology, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: Bart E M W
authors.initials: BE
authors.lastname: Stoffels
authors.affiliation: Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Microbiology, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: Theo
authors.initials: T
authors.lastname: van Alen
authors.affiliation: Research Centre for Oceanography (RCO), Indonesian Institute of Sciences (LIPI), Jl. Pasir Putih I, Ancol Timur, Jakarta 14430, Indonesia.
authors.forename: Yosephine
authors.initials: Y
authors.lastname: Tuti
authors.affiliation: Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, The Netherlands.
authors.forename: Bert W
authors.initials: BW
authors.lastname: Hoeksema
keywords: COI; Plakobranchus ocellatus; Sacoglossa; phylogeny; reproductive system; taxonomy