title: Prosorhynchus Odhner, 1905 (Digenea: Bucephalidae) from the orange-spotted grouper Epinephelus coioides (Hamilton, 1822) (Epinephelidae), including Prosorhynchus tonkinensis n. sp., from the Gulf of Tonkin, Vietnam.
abstract: A total of 169 specimens of the orange-spotted grouper Epinephelus coioides (Hamilton) were collected from fishermen and marine fish farms in the Gulf of Tonkin, Vietnam. Five different species of Prosorhynchus Odhner, 1905 were recorded, including P. tonkinensis n. sp. The new species differs from all other Prosorhynchus species in the presence of an indented posterior extremity. It can be distinguished from the most closely related P. atlanticus Manter, 1940 and P. crucibulum Rudolphi, 1819 by the extension of the uterus always to the level of the ovary, the width and premouth distance in the former, and the arched vitellarium and smaller egg size in the latter, and a different host and geographical region. Prosorhynchus sp. A (not fully identified in this study) has been earlier reported from E. coioides from New Caledonia (see Prosorhynchus sp. B of Bray and Justine, 2013), P. luzonicus Velasquez, 1959 is reported throughout South-East Asia, and Prosorhynchus sp. B (no further identification possible based on a single specimen in this study) and P. maternus Bray & Justine, 2006 are reported for the first time from Vietnam. The present study demonstrates a close relationship of the Prosorhynchus species composition in Vietnam with the Indo-Australian region, warranting further comparative studies among the different epinephelids.
authors.affiliation: Aquaculture and Sea-Ranching, Faculty of Agricultural and Environmental Sciences, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany. Fisheries College, Dinh Bang, Tu Son, Bac Ninh, Vietnam; Email: thuongfc@gmail.com.
authors.forename: Thuong Van
authors.initials: TV
authors.lastname: Truong
authors.affiliation: Aquaculture and Sea-Ranching, Faculty of Agricultural and Environmental Sciences, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany.; Email: harry.palm@uni-rostock.de.
authors.forename: Harry W
authors.initials: HW
authors.lastname: Palm
authors.affiliation: Research Institute for Aquaculture No. 1, Dinh Bang, Tu Son, Bac Ninh, Vietnam.; Email: buiquangte@gmail.com.
authors.forename: Te Quang
authors.initials: TQ
authors.lastname: Bui
authors.affiliation: Geochemistry and Environment, Vietnam Institute of Geosciences and Mineral Resources, Thanh Xuan, Hanoi, Vietnam.; Email: ngothithuyhuong@gmail.com.
authors.forename: Huong Thi Thuy
authors.initials: HT
authors.lastname: Ngo
authors.affiliation: Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK.; Email: rab@nhm.ac.uk.
authors.forename: Rodney A
authors.initials: RA
authors.lastname: Bray
mesh_terms: D000818:Animals; D001492:Bass; D005260:Female; D005393:Fish Diseases / Q000453:epidemiology / Q000469:parasitology*; D008297:Male; D013045:Species Specificity; D014200:Trematoda / Q000145:classification* / Q000502:physiology*; D014201:Trematode Infections / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*; D014744:Vietnam / Q000453:epidemiology