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Type: Article
Published: 2021-02-04
Page range: 134–146
Abstract views: 279
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Description of Bagarius vegrandis, a new species of sisorid catfish from Indochina (Actinopterygii: Siluriformes), with notes on the identity of Bagarius bagarius

c/o Lee Kong Chian Natural History Museum, 2 Conservatory Drive, Singapore 117377
c/o Lee Kong Chian Natural History Museum, 2 Conservatory Drive, Singapore 117377 Rue des Rauraques 6, 2800 Delémont, Switzerland
Pisces taxonomy morphology species delimitation Southeast Asia


Bagarius vegrandis, new species, is described from the Chao Phraya and Mekong river drainages. It differs from congeners in having a small maximum body size (to 220 mm SL vs. 520–1400 mm SL) and the adipose-fin origin markedly posterior to (vs. at vertical through or very slightly posterior to) the anal-fin origin. It further differs from congeners in having the following unique combination of characters: ovoid unculiferous plaques on dorsal surface of head, lateral margin of frontal not significantly deflected dorsally, eye diameter 11–15% HL, interorbital distance 23–28% HL, head width 18.3–22.3% SL, head depth 11.1–14.1% SL, filamentous extensions to first pectoral-fin element reaching to anus, dorsal spine width 10.6–13.9 times in its length, body depth at anus 8.7–12.0% SL, neural spines of the 4–6 vertebrae immediately anterior to adipose fin distally flattened but not forming series of prominent bumps along dorsal midline, length of adipose-fin base 10.8–13.0% SL, caudal-peduncle length 19.0–22.4% SL, caudal-peduncle depth 3.2–4.2% SL, 19–20 preanal vertebrae, and 39–40 total vertebrae. Bagarius bagarius (Hamilton, 1822) is demonstrated to be a species restricted to the Indian subcontinent (with Bagrus yarrelli Sykes, 1839, Pimelodus platespogon Valenciennes, in Jacquemont, 1839 and Pimelodus carnaticus Jerdon, 1849 as junior subjective synonyms) and Bagarius lica Volz, 1903 resurrected from synonymy with B. yarrelli as a valid species from Southeast Asia.



  1. Bleeker, P. (1847) Nieuwe bijdrage tot de kennis der Siluroieden van Java. Verhandelingen van het Bataviaasch Genootschap van Kunsten en Wetenschappen, 21, 1–12.

    Bleeker, P. (1853) Nalezingen op de ichthyologische fauna van Bengalen en Hindostan. Verhandelingen van het Bataviaasch Genootschap van Kunsten en Wetenschappen, 25, 1–164.

    Britz, R. (2019) Francis Hamilton’s Gangetic Fishes in colour. A new edition of the 1822 monograph, with reproductions of unpublished coloured illustrations. Edited, with an introduction and commentary by Ralf Britz. The Ray Society, London, 48 + viii + 405 + 7 pp., 228 pls.

    Hamilton, F. (1800–1823) Original manuscript notes concerning the Gangetic fishes. Part I. British Library, London. Available from: (accessed 27 December 2019).

    Hamilton, F. (1822) An account of the fishes found in the river Ganges and its branches. Archibald Constable, Edinburgh and Hurst, Robinson, London, 405 pp.

    Hora, S.L. (1949) Systematic position of siluroids in Hamilton’s “Gangetic Fishes”. Records of the Indian Museum, 46, 63–72.

    Hossain, M.Y. (2010) New maximum size record for the goonch Bagarius yarrelli (Sykes 1839) (Siluriformes: Sisoridae) from the Ganges River. Sains Malaysiana, 39, 157–159.

    Jiang, W.-S., Ng, H.H., Yang, J.-X. & Chen, X.-Y. (2011) Monophyly and phylogenetic relationships of the catfish genus Glyptothorax (Teleostei: Sisoridae) inferred from nuclear and mitochondrial gene sequences. Molecular Phylogenetics and Evolution, 61, 278–289.

    Kottelat, M. (1995) The fishes of the Mahakam River, East Borneo: an example of the limitations of zoogeographic analyses and the need for extensive fish surveys in Indonesia. Tropical Biodiversity, 2, 401–426.

    Kottelat, M. (2001) Fishes of Laos. WHT Publications, Colombo, 198 pp.

    Kottelat, M. (2013) The fishes of inland waters of Southeast Asia: a catalogue and core bibliography of the fishes known to occur in freshwaters, mangroves and estuaries. Raffles Bulletin of Zoology, Supplement, 27, 1–663.

    Ng, H.H. (2000) Bagrichthys vaillantii (Popta, 1906), a valid species of bagrid catfish from eastern Borneo (Teleostei: Siluriformes). Zoologische Mededelingen, 73, 327–332.

    Ng, H.H. (2015) Phylogenetic systematics of the Asian catfish family Sisoridae (Actinopterygii: Siluriformes). Ichthyological Exploration of Freshwaters, 26, 97–157.

    Ng, H.H. & Kottelat, M. (1999) Description of three new species of catfishes (Teleostei: Akysidae and Sisoridae) from Laos and Vietnam. Journal of South Asian Natural History, 5, 7–15.

    Ng, H.H. & Kottelat, M. (2013) Revision of the Asian catfish genus Hemibagrus Bleeker, 1862 (Teleostei: Siluriformes: Bagridae). Raffles Bulletin of Zoology, 61, 205–291.

    Roberts, T.R. (1983) Revision of the south and southeast Asian sisorid catfish genus Bagarius, with description of a new species from the Mekong. Copeia, 1983, 435–445.

    Sabaj, M.H. (2020) Codes for natural history collections in herpetology and ichthyology. Copeia, 108, 593­669.

    Weber, M. & de Beaufort, L.F. (1913) The Fishes of the Indo-Australian Archipelago. II. Malacopterygii, Myctophoidea, Ostpariophysi: I Siluroidea. E. J. Brill, Leiden, xx + 404 pp.