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Gymnocranius indicus, a new large-eye seabream from the Indian Ocean

Published online by Cambridge University Press:  04 April 2024

Wei-Jen Chen Open the ORCID record for Wei-Jen Chen [Opens in a new window] ,
Ryohei Miki ,
John Nevill  and
Philippe Borsa Open the ORCID record for Philippe Borsa [Opens in a new window]
Wei-Jen Chen
Affiliation:
Institute of Oceanography, National Taiwan University, No.1 Sec. 4 Roosevelt Rd, Taipei 10617, Taiwan
Ryohei Miki
Affiliation:
Kobayashi Branch, Miyazaki Prefectural Fisheries Research Institute, Kobayashi, Miyazaki, Japan
John Nevill
Affiliation:
Environment Seychelles, P.O. Box 1299, Victoria, Mahé, Seychelles
Philippe Borsa*
Affiliation:
Institut de recherche pour le développement, UMR 250 “Ecologie marine tropicale des océans Pacifique et Indien”, centre IRD Occitanie, 911 avenue Agropolis, 34394 Montpellier cedex, France
*
Corresponding author: Philippe Borsa; Email: philippe.borsa@ird.fr
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Abstract

Gymnocranius indicus sp. nov. is described as a new species of the fish subfamily Monotaxinae (Sparoidea: Lethrinidae), a group of commercially important species distributed throughout the Indo-West Pacific, on the basis of 16 specimens collected from the Indian Ocean. The new species shares the following characters with its western Pacific sibling, the eyebrowed large-eye seabream, G. superciliosus: elongate body, distinctive and conspicuous dark patch above the eye, prominent forehead, moderately forked caudal fin, its lobes slightly convex inside, flank silvery, and reddish-to-red dorsal, pectoral, anal and caudal fins. However, principal component analysis based on seven morphological variables distinguished most specimens from the Indian Ocean from G. superciliosus. The most influential variable in the analysis was the eye diameter, significantly larger in the new species than in G. superciliosus. All specimens of the new species that were examined also lacked blue ornamentation on the snout and cheek. At the mitochondrial cytochrome oxidase subunit-I locus, the mean genetic p-distance between the two species was 0.039. With Gymnocranius indicus sp. nov., the genus now includes 12 valid nominal species; three additional species remain undescribed.

ZooBank: urn:lsid:zoobank.org:pub:7E3750AB-D82B-4E36-B591-85C49261C379

Keywords

COI gene sequencedescriptionGymnocranius sp. HGymnocranius superciliosusmorphologynew species

Information

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 104 , 2024 , e38
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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