title: Integrative taxonomy of the genusOnchidiumBuchannan, 1800 (Mollusca, Gastropoda, Pulmonata, Onchidiidae).
abstract: In an effort to clarify the species diversity of onchidiid slugs, the taxonomy of the genusOnchidiumBuchannan, 1800 is revised using an integrative approach. New, fresh specimens were collected in a large number of places, including type localities. The genusOnchidiumis redefined here as a clade including only three species which are strongly supported by both morphological and molecular data. All three species were already named: the type speciesOnchidium typhaeBuchannan, 1800,Onchidium stuxbergi(Westerlund, 1883), andOnchidium reevesii(J.E. Gray, 1850). With the exception of a re-description ofOnchidium typhaepublished in 1869, all three species are re-described here for the first time. First-hand observations on the color variation of live animals in their natural habitat are provided. The anatomy of each species is described. Important nomenclatural issues are addressed. In particular,LabellaStarobogatov, 1976 is regarded as a junior synonym ofOnchidiumandLabella ajuthiae(Labbé, 1935) andOnchidium nigrum(Plate, 1893) are regarded as junior synonyms ofOnchidium stuxbergi. The nomenclatural status of several other species names is discussed as well. Many new records are provided across South-East Asia and precise ranges of geographic distributions are provided for the genusOnchidiumand its three species. Distinctive features that help distinguish the genusOnchidiumfrom other onchidiids are provided, as well as an identification key for the three species.
authors.affiliation: Department of Biology, Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: Benoît
authors.initials: B
authors.lastname: Dayrat
authors.affiliation: Department of Biology, Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: Tricia C
authors.initials: TC
authors.lastname: Goulding
authors.affiliation: Bombay Natural History Society, Mumbai, Hornbill House, Opp. Lion Gate, Shaheed Bhagat Singh Road, Mumbai 400 001, Maharashtra, India.
authors.forename: Deepak
authors.initials: D
authors.lastname: Apte
authors.affiliation: Bombay Natural History Society, Mumbai, Hornbill House, Opp. Lion Gate, Shaheed Bhagat Singh Road, Mumbai 400 001, Maharashtra, India.
authors.forename: Vishal
authors.initials: V
authors.lastname: Bhave
authors.affiliation: National Museum of the Philippines, Taft Ave, Ermita, Manila, 1000 Metro Manila, Philippines.
authors.lastname: Joseph Comendador
authors.affiliation: Institute of Tropical Biology, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Str., District 3, Ho Chi Minh city, Vietnam.
authors.forename: Ngô Xuân
authors.initials: NX
authors.lastname: Qua Ng
authors.affiliation: Lee Kong Chian Natural History Museum, 2 Conservatory Dr, National University of Singapore, 117377, Singapore.
authors.forename: Siong Kiat
authors.initials: SK
authors.lastname: Tan
authors.affiliation: Marine Science Laboratory, School of Biological Sciences, Universiti Sains Malaysia, 11800 Minden Penang, Malaysia.
authors.forename: Shau Hwai
authors.initials: SH
authors.lastname: Tan
keywords: Biodiversity; Euthyneura; Indo-West Pacific; South-East Asia; mangroves; marine slugs