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Type: Article
Published: 2017-05-08
Page range: 97–119
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Bythaelurus vivaldii, a new deep-water catshark (Carcharhiniformes, Scyliorhinidae) from the northwestern Indian Ocean off Somalia

Elasmo-Lab, Elasmobranch Research Laboratory, Schlägertwiete 5b, 21335 Lüneburg, Germany
Federal Office for Agriculture and Food, Department 522, Fisheries, Haubachstr. 86, 22765 Hamburg, Germany
taxonomy systematics Chondrichthyes Elasmobranchii new species Valdivia Pisces

Abstract

A new very small deep-water catshark, Bythaelurus vivaldii, is described based on two female specimens caught off Somalia in the northwestern Indian Ocean during the German ‘Valdivia’ expedition in 1899. It is morphologically closest to the recently described B. bachi, which is the only other Bythaelurus species in the western Indian Ocean that shares a stout body of large specimens and the presence of oral papillae. It further resembles B. vivaldii in the broad mouth and broad posterior head, but differs in the presence of composite oral papillae and a higher diversity in dermal denticle morphology. Additionally, the new species differs from all congeners in the western Indian Ocean in a larger pre-second dorsal fin length, a longer head, a larger interdorsal space, a larger intergill length, a longer pectoral-fin posterior margin, a shorter caudal fin, an intermediate caudal fin preventral margin, and a larger internarial width. Furthermore, the second dorsal fin of the new species is smaller than in its congeners in the western Indian Ocean except for B. lutarius, which is easily distinguished by the slender body and virtual absence of oral papillae, as well as the aforementioned further characters. An updated key to all valid species of Bythaelurus is provided.

References

  1. Alcock, A. (1891) Class Pisces. In: II.–Natural history notes from H.M. Indian marine survey steamer ‘Investigator’, Commander R.F. Hoskyn, R.N. commanding.–Series II., No. 1. On the results of deep-sea dredging during the season 1890–91. The Annals and Magazine of Natural History, 8 (6), 16–34.
    https://doi.org/10.1080/00222939109460385

    Alcock, A. (1899) A descriptive catalogue of the Indian deep-sea fishes in the Indian Museum. Being a revised account of the deep-sea fishes collected by the Royal Indian Marine Survey Ship Investigator. Indian Museum, Calcutta, 211 pp.
    https://doi.org/10.5962/bhl.title.4684

    Amante, C. & Eakins, B.W. (2009) ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis. NOAA Technical Memorandum, NEDIS NGDC-24, 1–19.

    Bass, A.J., D’Aubrey, J.D. & Kistnasamy, N. (1975) Sharks of the east coast of southern Africa. II. The families Scyliorhinidae and Pseudotriakidae. Investigational Report, Oceanograhic Research Institute, 37, 1–64.

    Brauer, A. (1908) Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer „Valdivia“ 1898–1899, Band XV: Die Tiefsee-Fische. I. Systematischer Teil. Gustav Fischer Verlag, Jena, 432 pp.

    Chu, Y.-T. & Meng, Q.-W. (1982) Halaelurus immaculatus sp. nov. In: Chu, Y.-T., Meng, Q.-W., Hu, A. & Li, S. (Authors), Five new species of elasmobranchiate fishes from the deep waters of South China Sea. Oceanologica et Limnologica Sinica, 13 (4), pp. 301–302, 309. [in Chinese with English summary]

    Chun, C. (1900) Aus den Tiefen des Weltmeeres. Schilderungen von der Deutschen Tiefsee-Expedition. Gustav Fischer Verlag, Jena, 549 pp.
    https://doi.org/10.5962/bhl.title.14876

    Compagno, L.J.V. (1984a) FAO species catalogue. Vol. 4, Sharks of the World. An annotated and illustrated catalogue of shark species known to date (Part 2, Carcharhiniformes). FAO Fisheries Synopsis, 125, 4 (2). FAO, Rome, pp. 251–655.

    Compagno, L.J.V. (1984b) FAO species catalogue. Vol. 4. Sharks of the World. An annotated and illustrated catalogue of shark species known to date (Part 1, Hexanchiformes to Lamniformes). FAO Fisheries Synopsis, 125, 4 (1). FAO, Rome, 249 pp.

    Compagno, L.J.V. (1988) Sharks of the order Carcharhiniformes. Princeton University Press, New Jersey, 486 pp.

    Compagno, L.J.V. (1999) Checklist of Living Elasmobranchs. In: Hamlett, W.C. (Ed.), Sharks, Skates, and Rays – The Biology of Elasmobranch Fishes. The Johns Hopkins University Press, Baltimore, pp. 471–498.

    Compagno, L.J.V. (2005) Checklist of Living Chondrichthyes. In: Hamlett, W.C. (Ed.), Reproductive Biology and Phylogeny of Chondrichthyes – Sharks, Batoids and Chimaeras. Science Publishers Inc., Enfield, pp. 503–548.

    Compagno, L.J.V., Dando, M. & Fowler, S. (2005) A field guide to the Sharks of the World. Harper Collins Publishing Ltd., London, 368 pp.

    Ebert, D.A. & Clerkin, P.J. (2015) A new species of deep-sea catshark (Scyliorhinidae: Bythaelurus) from the southwestern Indian Ocean. Journal of the Ocean Science Foundation, 15, 53–63.

    Ebert, D.A., Fowler, S. & Compagno, L.J.V. (2013) Sharks of the world: a fully illustrated guide to the sharks of the world. Wild Nature Press, Devon, 528 pp.

    Garman, S. (1913) The Plagiostomia (Sharks, Skates, and Rays). Memoirs of the Museum of Comparative Zoology at Harvard College, XXXVI, 1–528.
    https://doi.org/10.5962/bhl.title.43732

    Gill, T. (1862) Squalorum Generum Novum Descriptiones Diagnosticae. Annals of the Lyceum of Natural History of New York, 7 (1), 409–413.
    https://doi.org/10.1111/j.1749-6632.1862.tb00167.x

    Günther, A. (1878) Preliminary Notices of Deep-Sea Fishes collected during the Voyage of H.M.S. ‘Challenger.’ Annals and Magazine of Natural History, 2 (5), 17–28.
    https://doi.org/10.1080/00222937808682376

    Herman, J., Hovestadt-Euler, M. & Hovestadt, D.C. (1990) Part A: Selachii. No. 2b: Order : Carcharhiniformes - Family: Scyliorhinidae. In: Stehmann, M. (Ed.), Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living supraspecific taxa of Chondrichthyan fishes. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie, 60, pp. 181–230.

    Hovestadt, D.C. & Hovestadt-Euler, M. (1995) Additions to the fauna of the Boom Clay Formation of Beglium (Rupelian, Oligocene). Taxonomic adjustments on the Scyliorhinidae and Rajoidei, discovery of a dasyatid species (Pisces, Chondrichthyes) and of a curculionid species (Insecta, Coleoptera). Belgian Geological Survey Professional Paper, 278, 261–282.

    Kaschner, C.J., Weigmann, S. & Thiel, R. (2015) Bythaelurus tenuicephalus n. sp., a new deep-water catshark (Carcharhiniformes, Scyliorhinidae) from the western Indian Ocean. Zootaxa, 4013 (1), 120–138.
    https://doi.org/10.11646/zootaxa.4013.1.9

    Last, P.R. & Stevens, J.D. (2008) Bythaelurus incanus sp. nov., a new deepwater catshark (Carcharhiniformes: Scyliorhinidae) from northwestern Australia. In: Last, P.R., White, W.T. & Pogonoski, J.J. (Eds.), Descriptions of New Australian Chondrichthyans. CSIRO Marine & Atmospheric Research Paper, No. 022, pp. 123–128.

    McCosker, J.E., Long, D.J. & Baldwin, C.C. (2012) Description of a new species of deepwater catshark, Bythaelurus giddingsi sp. nov., from the Galápagos Islands (Chondrichthyes: Carcharhiniformes: Scylorhinidae). Zootaxa, 3221, 48–59.

    Nakaya, K., Sato, K., Iglésias, S.P. & White, W.T. (2008) Methodology for the taxonomic description of members of the genus Apristurus (Chondrichthyes: Carcharhiniformes: Scyliorhinidae). In: Last, P.R., White, W.T. & Pogonoski, J.J. (Eds.), Descriptions of new Australian chondrichthyans. CSIRO Marine & Atmospheric Research Paper, No. 022, pp. 49–60.

    Sabaj, M.H. (Ed.) (2016) Standard Symbolic Codes for Institutional Resource Collections in Herpetology and Ichthyology: an Online Reference, Version 6.5 (16 August 2016). Available from: http://www.asih.org/ (accessed 29 August 2016)

    Schott, G. (1902) Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer „Valdivia“ 1898–1899, Band I: Oceanographie und maritime Meteorologie. Gustav Fischer Verlag, Jena, 403 pp.

    Séret, B. (1987) Halaelurus clevai, sp. n., a new species of catshark (Scyliorhinidae) from off Madagascar, with remarks on the taxonomic status of the genera Halaelurus Gill & Galeus Rafinesque. J.L.B. Smith Institute of Ichthyology Special Publication, 44, 1–27.

    Springer, S. (1971) A new cat shark (Scyliorhinidae) from New Zealand. Records of the Dominion Museum, 7 (18), 235–241.

    Springer, S. (1979) A revision of the catsharks, family Scyliorhinidae. NOAA Technical Report NMFS Circular, 422, 1–152.
    https://doi.org/10.5962/bhl.title.63029

    Springer, S. & D’Aubrey, J.D. (1972) Two New Scyliorhinid Sharks from the East Coast of Africa with Notes on Related Species. Oceanographic Research Institute, Investigational Report, 29, 1–19.

    Springer, V.G. & Garrick, J.A.F. (1964) A survey of vertebral numbers in sharks. Proceedings of the United States National Museum, 116, 73–96.
    https://doi.org/10.5479/si.00963801.116-3496.73

    Tizard, T.H., Moseley, H.N., Buchanan, J.Y. & Murray, J. (1885) Narrative of the cruise of H.M.S. Challenger with a general account of the scientific results of the expedition. Report on the scientific results of the voyage of H.M.S. Challenger during the years 1873–76. Narrative, 1 (2), 511–1110.

    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.
    https://doi.org/10.1111/jfb.12874

    Weigmann, S., Ebert, D.A., Clerkin, P.J., Stehmann, M.F.W. & Naylor, G.J.P. (2016) Bythaelurus bachi n. sp., a new deep-water catshark (Carcharhiniformes, Scyliorhinidae) from the southwestern Indian Ocean, with a review of Bythaelurus species and a key to their identification. Zootaxa, 4208 (5), 401–432.
    https://doi.org/10.11646/zootaxa.4208.5.1