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Issue: Vol. 4184 No. 1: 3 Nov. 2016
Type: Article
Published: 2016-11-02
DOI: 10.11646/zootaxa.4184.1.3
Page range: 52–62
Abstract views: 82
PDF downloaded: 5

A new skate genus Orbiraja (Rajiformes: Rajidae) from the Indo-West Pacific

CSIRO National Research Collections Australia, Australian National Fish Collection, Castray Esplanade, Hobart, TAS, 7001, AUSTRALIA.
Elasmo-Lab, Elasmobranch Research Laboratory, Schlägertwiete 5b, 21335 Lüneburg, GERMANY.
National Museum of the Philippines, Rizal Park, Manila, PHILIPPINES.
Pisces Rajidae Orbiraja Orbiraja jensenae new genus first adult male Indo–West Pacific

Abstract

Molecular analyses and information gleaned from an examination of the newly available adult male of the North-West Pacific skate, Okamejei jensenae Last & Lim, supported earlier concerns that the species might be mis-assigned. Morphological data based on this specimen supported its placement in a new genus Orbiraja that is assigned to the recently named Rostrorajini based on molecular evidence. This subgroup of the family Rajidae also includes Malacoraja, Neoraja, Rostroraja and an unresolved ‘amphi-American Assemblage’ (sensu McEachran & Dunn, 1998). Orbiraja is unique within the rajids in having the combination of three, very closely spaced median thorn rows on the tail, no dark-edged ventral pores, and a clasper skeleton with a prominent accessory terminal 3 cartilage formed by a medio-distal extension of the accessory terminal 2 cartilage. Its spiracle appears to be situated posteriorly with respect to the orbit. The group contains two other nominal species, Orbiraja powelli (Alcock) and O. philipi (Lloyd), and an un-named species from Indonesia that needs further investigation. Orbiraja jensenae is rediagnosed based on characteristics of the adult male.

 

References

  1. Alcock, A.W. (1898) Natural history notes from H. M. Indian marine survey ship ‘Investigator’, Commander T. H. Heming, R. N., commanding. Series II., No. 25. A note on the deep-sea fishes, with descriptions of some new genera and species, including another probably viviparous ophidioid. Annals and Magazine of Natural History (Series 7), 2 (8), 136–156.

    Chiquillo, K.L., Ebert, D.A., Slager, C.J. & Crow, K.D. (2014) The secret of the mermaid's purse: phylogenetic affinities within the Rajidae and the evolution of a novel reproductive strategy in skates. Molecular Phylogenetics and Evolution, 75, 245–251.
    http://dx.doi.org/10.1016/j.ympev.2014.01.012

    Hulley, 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, 131–158.

    Last, P.R. & Lim, A.P.K. (2010) A new species of skate Okamejei jensenae sp. nov. (Rajoidei: Rajidae) from the seas off Borneo, with a redescription of the Kwangtung Skate, Dipturus kwangtungensis (Chu), pp. 101–114. In: P.R. Last, W.T. White, J.J. Pogonoski (Eds.), Descriptions of New Sharks and Rays from Borneo. CSIRO Marine and Atmospheric Research Paper, 032, 165 pp.

    Last, P.R., Séret, B., Stehmann, M. F.W. & Weigmann, S. (In press) Chapter 20. Skates, Family Rajidae. 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.

    Last, P.R., White, W.T., Pogonoski, J.J. & Gledhill, D.C. (2008) New Australian skates (Batoidea: Rajoidei) – background and methodology, pp. 1–8. In: Last, P.R., White, W.T., Pogonoski, J.J. & Gledhill, D.C. (Eds.), Descriptions of New Australian Skates (Batoidea: Rajoidei). CSIRO Marine & Atmospheric Research Paper, 021, 181 pp.

    Lloyd, R.E. (1906) Natural history notes from the R.I.M.S. ship ‘lnvestigator’. Notes on the skull of the genus Aulostomatomorpha, with descriptions of some new deep-sea fish. Annals and Magazine of Natural History, 18 (7), 306–311.
    http://dx.doi.org/10.1080/00222930608562615

    McEachran, J.D. & Dunn, K.A. (1998) Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia, 1998 (2), 271–290.
    http://dx.doi.org/10.2307/1447424

    McEachran, J.D. & Fechhelm, J.D. (1982) A new species of skate from western Australia with comments on the status of Pavoraja Whitley, 1939 (Chondrichthyes: Rajiformes). Proceedings of the Biological Society of Washington, 95, 1–12.

    Naylor, G.J.P., Caira, J.N., Jensen, K., Rosana, K.A.M., Straube, N. & Lakner C. (2012) 2. Elasmobranch Phylogeny: A Mitochondrial Estimate Based on 595 Species. In: Carrier, J.C., Musick, J.A. & Heithaus M.R. (Eds.), Biology of Sharks and Their Relatives, Second Edition, 595 pp.
    http://dx.doi.org/10.1201/b11867-4

    Stehmann, M. (1970) Vergleichend morphologische und anatomische Untersuchungen zur Neuordnung der Systematik der nordostatlantischen Rajidae (Chondrichthyes, Batoidei). Archiv für Fischereiwissenschaft, 21 (2), 73–164.

    Weigmann, S., Stehmann, M.F.W. & Thiel, R. (2015) Okamejei ornata n. sp., a new deep-water skate (Elasmobranchii, Rajidae) from the northwestern Indian Ocean off Socotra Islands. Deep-Sea Research II, 115, 18–29.
    http://dx.doi.org/10.1016/j.dsr2.2013.09.005

    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.12874