Abstract
This review was motivated by the recent collection of a specimen of the specious cuskeel genus Neobythites (Ophidiidae) off Myanmar and difficulties to identify it based on the available literature. This specimen has an ocellus consisting of a dark oval spot and a concentric white ring placed on the dorsal fin at mid-body, typical for many Neobythites species. It belongs to a group of single-ocellus bearing species which have no or only one weakly developed, flat preopercular spine which we term here the “steatiticus-species group”. Before this study, the steatiticus group consisted of six Indo-Pacific species, N. longipes, N. malhaensis, N. malayanus, N. meteori, N. steatiticus, and N. stefanovi, and the Atlantic N. monocellatus. From 136 specimens representing the six Indo-Pacific steatiticus-group species counts or measurements of 12 meristic, 14 body shape, five ocellus and six otolith characters were obtained and compared, revealing two undescribed species. We describe N. gloriae n. sp. from the Arabian Gulf and inner Gulf of Oman based on nine specimens that had been previously misidentified as N. steatiticus and N. stefanovi. The latter species differ from the new species and from each other in the combination of five characters, head length, orbit length, gill-filament length, ocellus-spot distance, and ocellus-spot size. The second new species described is N. lombokensis n. sp. which consists of a single specimen from off SE Lombok, southern Indonesia. It differs from all other steatiticus-group species in having a larger ocellus spot and in several meristic and morphometric characters. The specimen from off Myanmar, eastern Bay of Bengal, was found to belong to N. steatiticus, providing new information on distribution and colour. Diagnoses, updated distribution information, and a key for the eight Indo-Pacific steatiticus-group species are here presented. We discuss our findings with special emphasis on the variation and possible function of colour patterns in Neobythites, being important for understanding the ecology and evolution of this specious genus.
References
Alcock, A. (1893) New species of Lophius, Neobythites, Odontostomus and Congromuraena. Journal of Asiatic Society Bengal, 62, 177–184.
Alcock, A. (1898) Illustrations of the zoology of H.M. Indian marine surveying steamer "Investigator". Royal Indian Marine, Calcutta, part V, plates 18–24.
Fricke, R. & Eschmeyer, W.N. (2017) Guide to fish collections. Available from: http://researcharchive.calacademy.org/research/ichthyology/catalog/collections.asp (accessed 11 July 2017)
Gloerfelt-Tarp, T. & Kailola, P.J. (1984) Trawled fishes of southern Indonesia and northwestern Australia. Australian Development Assistance Bureau, Australia, Directorate General of Fishes, Indonesia, and German Agency for Technical Cooperation, Federal Republic of Germany, 407 pp.
Jawad, L.A. (2014) New record of Neobythites steatiticus Alcock, 1894 (Actinopterygii: Ophidiidae) from the marine waters of Iraq. International Journal of Marine Science, 4 (32), 1–3.
Kannan, K., John, S., Joshi, K.K. & Zacharia, P.U. (2013) First record of Neobythites stefanovi (Teleostei: Ophidiidae) from Indian waters. Marine Biodiversity Records, 6, e71.
https://doi.org/10.1017/S1755267213000523
Kotthaus, A. (1979) Fische des Indischen Ozeans, XXI.“Meteor” Forschungsergebnisse, Series D (28), 6–54.
Nielsen, J.G. (1995) A review of the species of the genus Neobythites (Pisces, Ophidiidae) from the western Indian Ocean with description of seven new species. Ichthyological Bulletin, 62, 1–19.
Nielsen, J.G. (1999) A review of the genus Neobythites (Teleostei, Ophidiidae) in the Atlantic, with three new species. Bulletin of Marine Science, 65 (2), 335–372.
Nielsen, J.G. (2002) Revision of the Indo-Pacific species of Neobythites (Teleostei, Ophidiidae) with 15 new species. Galathea Report, 19, 5–105.
Nielsen, J.G., Cohen, D.M., Markle, D.F. & Robins, R.C. (1999) FAO species catalogue. Ophidiiform fishes of the world (Order: Ophidiiformes), 125 (18). FAO Fisheries Synopses, Rome, 178 pp.
Nielsen, J.G. & Machida, Y. (2006). Neobythitoides serratus, a new bathyal genus and species from the East China Sea (Teleostei, Ophidiidae). Zootaxa, 1227, 63–68.
Nielsen, J.G. & Uiblein F. (1993) Tiefenwasser- und Tiefseefische aus dem Roten Meer. XVI. A new species of Neobythites from the NW Indian Ocean and the Red Sea. Senckenbergiana maritima, 23, 109–113.
Nielsen, J.G., Uiblein, F. & Mincarone, M.M. (2009) Ocellus-bearing Neobythites species (Teleostei: Ophidiidae) from the West Atlantic with description of a new species. Zootaxa, 2228, 57–68.
Nielsen, J.G. & Uiblein, F. (2014) The West Pacific Neobythites bimarginatus (Ophidiidae) recorded from off Madagascar. Cybium, 38, 309–310.
Norman, J.R. (1939) Fishes. Scientific Report of the John Murray Expedition (1933–34), 7 (1), 1–116.
Ohashi, S., Nielsen, J.G. & Yabe, M. (2012) A new species of the ophidiid genus Neobythites (Teleostei: Ophidiiformes) from Tosa Bay, Kochi Prefecture, Japan. Bulletin of the National Museum of Natural Sciences, Series A, Supplement, 6, 27–32.
Radcliffe, L. (1913) Descriptions of seven new genera and thirty-one new species of fishes of the families Brotulidae and Carapidae from the Philippines Islands and the Dutch East Indies. Proceedings of the U.S. National Museum, 44, 135–176.
https://doi.org/10.5479/si.00963801.44-1948.135
Uiblein, F. (1995) Morphological variability between populations of Neobythites stefanovi (Pisces: Ophidiidae) from the deep Red Sea and the Gulf of Aden. Marine Ecology Progress Series, 124, 23–29.
https://doi.org/10.3354/meps124023
Uiblein, F. (1996) Constraints and exploratory windows in light-reduced marine habitats. In: Uiblein, F., Ott, J. & Stachowitsch, M. (Eds.), Deep-sea and extreme shallow-water habitats: affinities and adaptations. Biosystematics and Ecology Series, 11, 165–182.
Uiblein, F. & Nielsen, J.G. (2005) Ocellus variation and possible functions in the genus Neobythites (Teleostei: Ophidiidae). Ichthyological Research, 52, 364–372.
https://doi.org/10.1007/s10228-005-0298-y
Uiblein, F., Nielsen, J.G. & Møller, P.R. (2008) Systematics of the ophidiid genus Spectrunculus (Teleostei: Ophidiiformes) with resurrection of S. crassus. Copeia 2008 (3), 542–551.
https://doi.org/10.1643/CI-07-027
Weber, M. (1913) Die Fische der Siboga-Expedition. Siboga-Expedition, 57, 1–710.