Abstract
A new species of Macrognathus of the M. aculeatus species group is described from the Kahayan River drainage in southern Borneo, Kalimantan Tengah, Indonesia. Macrognathus kris, new species, is distinguished from all Asian congeners in having the following unique combination of characters: rim of anterior nostril with two fimbriae and two fimbrules; 43–45 rostral tooth plates; 24–25 dorsal spines; 46–55 dorsal-fin rays; 51–59 anal-fin rays; 20–23 principal caudal-fin rays; 76–78 total vertebrae; body depth at anus 11.8–15.9% SL; color pattern consisting of light brown stripe on dorsum and 11–14 irregular pentagonal dark brown blotches on sides of body.
References
Arunkumar, L. (2016) Macrognathus siangensis, a new spiny eel from Brahmaputra basin, Arunachal Pradesh, Northeast India (Teleostei: Synbranchiformes). Journal of Research in Biology, 6, 2003–2012.
Arunkumar, L. & Tombi Singh, H. (2000) Spiny eels of the genus Macrognathus Lacepede from Manipur, with description of a new species. Journal of the Bombay Natural History Society, 97 (1), 117–122.
Blyth, E. (1858) A small collection from Major Berdmore, sent by him from the Sitang valley, Pegu. Journal and Proceedings of the Asiatic Society of Bengal, 1858 (3), 281–290.
Bloch, M.E. & Schneider, J.G. (1801) M. E. Blochii, Systema Ichthyologiae Iconibus cx Ilustratum. Post obitum auctoris opus inchoatum absolvit, correxit, interpolavit Jo. Gottlob Schneider, Saxo. Berolini. Sumtibus Auctoris Impressum et Bibliopolio Sanderiano Commissum, lx + 584 pp., 110 pls.
https://doi.org/10.5962/bhl.title.5750
Boulenger, G.A. (1893) List of the fishes collected by Mr. E. W. Oates in the Southern Shan States, and presented by him to the British Museum. Annals and Magazine of Natural History, Series 6, 12 (69), 198–203.
https://doi.org/10.1080/00222939308677602
Brown, K.J., Rüber, L., Bills, R. & Day, J.J. (2010) Mastacembelid eels support Lake Tanganyika as an evolutionary hotspot of diversification. BMC Evolutionary Biology, 10, 188.
https://doi.org/10.1186/1471-2148-10-188
Britz, R. (2010a) Species of the Macrognathus aculeatus group in Myanmar with remarks on M. caudiocellatus (Teleostei: Synbranchiformes: Mastacembelidae). Ichthyological Exploration of Freshwaters, 20, 295–308.
Britz, R. (2010b) Macrognathus aureus, a new spiny eel of the M. aculeatus species group from the Upper Ayeyarwaddy River drainage, Myanmar (Teleostei: Synbranchiformes: Mastacembelidae). Zootaxa, 2514 (1), 55–60.
https://doi.org/10.11646/zootaxa.2514.1.5
Britz, R. & Kottelat, M. (2020) Macrognathus orthosemos, a new species of spiny eel from southern Myanmar (Teleostei: Synbranchiformes: Mastacembelidae). Ichthyological Exploration of Freshwaters, 30, 75–81.
Day, F. (1865) On the fishes of Cochin, on the Malabar coast of India. Part I. Acanthopterygii. Proceedings of the Zoological Society of London, Pt 1 (Art. 1), 2–40.
https://doi.org/10.1111/j.1469-7998.1865.tb02299.x
Gray, J.E. (1854) Catalogue of fish collected and described by Laurence Theodore Gronow, now in the British Museum. Department of Zoology, British Museum (Natural History), London, vii + 196 pp.
Günther, A. (1861) Catalogue of the fishes in the British Museum. Catalogue of the acanthopterygian fishes in the collection of the British Museum. Gobiidae, Discoboli, Pediculati, Blenniidae, Labyrinthici, Mugilidae, Notacanthi. Vol. 3. Department of Zoology, British Museum (Natural History), London, xxv + 586 + x pp.
Hamilton, F. (1822) An account of the fishes found in the river Ganges and its branches. Hurst, Robinson, and Co., Edinburgh & London, vii + 405 pp., 39 pls.
https://doi.org/10.5962/bhl.title.59540
Herre, A.W.C.T. & Myers, G.S. (1937) A contribution to the ichthyology of the Malay Peninsula. Bulletin of the Raffles Museum, 13, 5–75, pls. 1–7.
Kottelat, M. (2013) The fishes of the inland waters of southeast Asia: a catalogue and core biography of the fishes known to occur in freshwaters, mangroves and estuaries. Raffles Bulletin of Zoology Supplement, 27, 1–663.
Kottelat, M. & Widjanarti, E. (2005) The fishes of Danau Sentarum National Park and the Kapuas Lakes area, Kalimantan Barat, Indonesia. Raffles Bulletin of Zoology Supplement, 13, 139–173.
Lees, C., Gibson, C., Jaafar, Z., Ng, H.H., Tan, H.H., Chua, K.W.J., Thorton, S.A. & Van Veen, F.J.F. (2020) Assessing to Plan: next steps towards conservation action for threatened fishes of the Sunda region. IUCN Conservation Planning Specialist Group, Apple Valley, Minnesota, 44 pp.
Ng, H.H. (2020) Nanobagrus immaculatus. The IUCN Red List of Threatened Species, 2020. [e.T91182854A91182861. Downloaded on 9 July 2020]
Pethiyagoda, R., Silva, A., Maduwage, K. & Kariyawasam, L. (2008) The Sri Lankan spiny eel, Macrognathus pentophthalmos (Teleostei: Mastacembelidae), and its enigmatic decline. Zootaxa, 1931 (1), 37–48.
https://doi.org/10.11646/zootaxa.1931.1.3
Plamoottil, M. & Abraham, N.P. (2013) Rediscovery of Mastacembelus malabaricus after one and half century. Research Journal of Animal, Veterinary and Fishery Sciences, 1, 6–11.
Plamoottil, M. & Abraham, N.P. (2014a) Macrognathus fasciatus (Synbranchiformes; Mastacembelidae)—a new fish species from Kerala, India. Journal of Experimental Zoology of India, 17, 49–54.
Plamoottil, M. & Abraham, N.P. (2014b) Macrognathus albus (order: Synbranchiformes; family: Mastacembelidae), a new fish species from Kerala, India. International Journal of Pure and Applied Zoology, 2, 100–105.
Roberts, T.R. (1980) A revision of the Asian mastacembelid fish genus Macrognathus. Copeia, 1980, 385–391.
https://doi.org/10.2307/1444512
Roberts, T.R. (1986) Systematic review of the Mastacembelidae or spiny eels of Burma and Thailand, with description of two new species of Macrognathus. Japanese Journal of Ichthyology, 33, 95–109.
https://doi.org/10.1007/BF02905838
Roberts, T.R. (1989) The freshwater fishes of western Borneo (Kalimantan Barat, Indonesia). Memoirs of the California Academy of Sciences, 14, i–xii + 1–210.
Sufi, S.M.K. (1956) Revision of the Oriental fishes of the family Mastacembelidae. Bulletin of the Raffles Museum, 27, 93–146, pls. 13–26.
Travers, R.A. (1984a) A review of the Mastacembeloidei, a suborder of synbranchiform teleost fishes. Part I: Anatomical descriptions. Bulletin of the British Museum (Natural History), Zoology Series, 46, 1–133.
Travers, R.A. (1984b) A review of the Mastacembeloidei, a suborder of synbranchiform teleost fishes. Part II: Phylogenetic analysis. Bulletin of the British Museum (Natural History), Zoology Series, 47, 83–150.
https://doi.org/10.5962/bhl.part.21835
Vreven, E.J. & Teugels, G.G. (1996) Description of a new mastacembelid species (Synbranchiformes; Mastacembelidae) from the Zaïre River basin in Africa. Copeia, 1996, 130–139.
https://doi.org/10.2307/1446948
Yazdani, G.M. (1990) Contribution to the fish fauna of India (including adjacent countries) Order Mastacembeliformes. Records of the Zoological Survey of India, Occasional Papers, 124, 1–36.