Abstract
Sinobatis kotlyari n. sp. is described, based on the nearly adult 331 mm TL holotype male from 1400 m depth in the southeastern Indian Ocean at Broken Ridge. The new species is assigned to Sinobatis due to mainly characters of its clasper and cranium fontanelle distinguishing it from congeners and other anacanthobatid skates with clasper features known. It further differs from its morphologically closest congener, S. borneensis, which is only known from the northwestern Pacific Ocean, e.g. in larger maturing size, longer snout and head, the absence of a snout filament and skin fold on tail, a longer caudal fin, and in colouration. The two congeners known from the eastern Indian Ocean, S. bulbicauda and S. cae-rulea, mature at much larger size, grow to larger maximum size and differ in numerous morphometric and meristic characters, as well as in colouration. The type locality appears to be very remote as compared with other Indian Ocean legskates, which have primarily been found on continental and insular slopes.
References
Amante, C. & Eakins, B.W. (2009) ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis. NOAA Technical Memorandum, NESDIS NGDC-24, 1–19.
Bigelow, H.B. & Schroeder, W.C. (1953) Fishes of the Western North Atlantic. Part two. Sawfishes, Guitarfishes, Skates and Rays, Chimaeroids. Memoirs Sears Foundation of Marine Research, 1 (2), i–xv + 1–588.
http://dx.doi.org/10.5962/bhl.title.7464Chan, W.L. (1965) Anacanthobatis borneensis, the second new anacanthobatid skate from the South China Sea. Japanese Journal of Ichthyology, 13, 46–51.
Clark, R.S. (1926) Rays and skates, a revision of the European species. Fisheries, Scotland, Scientific Investigations, 1, 1–66.
Compagno, L.J.V., Stehmann, M. & Ebert, D.A. (1990) Rhinochimaera africana, a new longnose chimaera from southern Africa, with comments on the systematics and distribution of the genus Rhinochimaera Garman, 1901 (Chondrichthyes, Chimaeriformes, Rhinochimaeridae). South African Journal of Marine Science, 9 (1), 201–222.
http://dx.doi.org/10.2989/025776190784378646Hubbs, C.L. & Ishiyama, R. (1968) Methods for the Taxonomic Study and Description of Skates (Rajidae). Copeia, 1968 (3), 483–491.
http://dx.doi.org/10.2307/1442016Hulley, P.A. (1970) An investigation of the Rajidae of the west and south coasts of southern Africa. Annals of the South African Museum, 55 (4), 151–220.
Hulley, P.A. (1972) The origin, interrelationships and distribution of southern African Rajidae (Chondrichthyes, Batoidei). Annals of the South African Museum, 60, 1–103.
Hulley, P.A. (1973) Interrelationships within the Anacanthobatidae (Chondrichthyes, Rajoidea), with a description of the lectotype of Anacanthobatis marmoratus von Bonde & Swart, 1923. Annals of the South African Museum, 62 (4), 131–158.
Ishiyama, R. (1958) Studies on the rajid fishes (Rajidae) found in the waters around Japan. Journal of the Shimonoseki College of Fisheries, 7 (2/3), 193–394.
Krefft, G. (1968) Knorpelfische (Chondrichthyes) aus dem tropischen Ostatlantik. Atlantide Report No. 10, 33–76.
Last, P. R. & Séret, B. (2008) Three new legskates of the genus Sinobatis (Rajoidei: Anacanthobatidae) from the Indo–West Pacific. Zootaxa, 1671, 33–58.
McEachran, J.D. & Compagno, L.J.V. (1979) A further description of Gurgesiella furvescens with comments on the interrelationships of Gurgesiellidae and Pseudorajidae (Pisces, Rajoidei). Bulletin of Marine Science, 29 (4), 530–553.
Sabaj Pérez, M.H. (Ed.) (2014) Standard Symbolic Codes for Institutional Resource Collections in Herpetology and Ichthyology: an Online Reference, Version 5.0 (22 September 2014). Available from: http://www.asih.org/ (accessed 13 December 2014)
Séret, B. (1986) Deep water skates of Madagascar, Part1. Anacanthobatidae (Pisces, Chondrichthyes, Batoidea), second record of the skate Anacanthobatis ori (Wallace, 1967) from off Madagascar. Cybium, 10 (4), 307–326.
Séret, B., Last, P.R., Weigmann, S. & Stehmann, M.F.W. (2016) Legskates, family Anacanthobatidae. In: Last, P.R., White, W.T., Carvalho, M.R. de, Séret, B., Stehmann, M.F.W. & Naylor, G.J.P. (Eds.), Rays of the World. CSIRO Publishing, Melbourne, pp. 494–508. [in press]
Shen, S.-C. (1986) A New Species Hexatrygon brevirostra and a New Record Anacanthobatis borneensis (Rajiformes) from Taiwan. Journal of the Taiwan Museum, 39 (2), 105–110.
Springer, V.G. & Garrick, J.A.F. (1964) A survey of vertebral numbers in sharks. Proceedings of the United States National Museum, 116 (3496), 73–96.
http://dx.doi.org/10.5479/si.00963801.116-3496.73
Stehmann, M. (1970) Vergleichend morphologische und anatomische Untersuchungen zur Neuordnung der Systematik der nordostatlantischen Rajidae (Chondrichthyes, Batoidei). Archiv für Fischereiwissenschaft, 21 (2), 73–164.
Stehmann, M. (1985) Ergebnisse der Forschungsreisen des FFS "Walther Herwig" nach Südamerika. LXIV. Bathyraja papilionifera sp. n. (Pisces, Batoidea, Rajidae), eine weitere neue Rochenart aus dem Südwestatlantik vom nordargentinischen Kontinentalabhang. Archiv für Fischereiwissenschaft, 36 (1/2), 195–211.
Stehmann, M.F.W., Séret, B., Costa, M.E. & Baro, J. (2008) Neoraja iberica n. sp., a new species of pygmy skate (Elasmobranchii, Rajidae) from the southern upper slope of the Iberian Peninsula (Eastern North Atlantic). Cybium, 32 (1), 51–71.
Weigmann, S. (2016) Annotated checklist of the living sharks, batoids and chimaeras (Chondrichthyes) of the world, with a focus on biogeographical diversity. Journal of Fish Biology, 88 (3), 837–1037.
http://dx.doi.org/10.1111/jfb.12874Weigmann, S. & Stehmann, M.F.W. (2016) Sinobatis brevicauda n. sp., a new deep-water legskate (Rajiformes, Anacanthobatidae) and first generic record from the western Indian Ocean. Zootaxa, 4137 (4), 478–500.
http://dx.doi.org/10.11646/zootaxa.4137.4.2Weigmann S., Stehmann M.F.W. & Thiel R. (2014) Complementary redescription of Anacanthobatis ori (Wallace, 1967) and its assignment to Indobatis n. g. (Elasmobranchii, Anacanthobatidae), with comments on other legskates. Zootaxa, 3779 (2), 101–132.
http://dx.doi.org/10.11646/zootaxa.3779.2.1
Weigmann, S., Séret, B., Last, P.R. & McEachran, J.D. (2016) Pygmy skates, family Gurgesiellidae. In: Last, P.R., White, W.T., Carvalho, M.R. de, Séret, B., Stehmann, M.F.W. & Naylor, G.J.P (Eds.), Rays of the World. CSIRO Publishing, Melbourne, pp. 473–493. [in press]