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| image = Rhynchobatus djiddensis durban.jpg | image_width = 240px | image_caption = Giant guitarfish (''R. djiddensis'') | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Elasmobranchii | ordo = Rajiformes | familia = Rhynchobatidae | familia_authority = Garman, 1913 | genus = ''Rhynchobatus'' | genus_authority = J. P. Müller & Henle, 1837 | type_species = ''Rhinobatus laevis'' | type_species_authority = Bloch & J. G. Schneider, 1801 }} ''Rhynchobatus'' is a group of rays commonly known as wedgefishes, and the sole genus in the family Rhynchobatidae. They are found in the tropical and subtropical Indo-Pacific with a single species (''R. luebberti'') in the eastern Atlantic. All species in this genus are assessed as Vulnerable or Endangered by IUCN. The species are superficially similar and have often been confused. The various species can generally be separated by a combination of snout shape, vertebral count and exact colour (distribution of white spots, and presence/absence of a black spot at the base of the pectoral fin).〔 The largest species can reach about and are among the largest species of rajiforms, but the smallest only reach around half that size.〔 ==Species== There are currently seven recognized species in this genus:〔 In the past all the Indo-Pacific species have been confused with ''R. djiddensis'', which as presently defined is restricted to the western Indian Ocean.〔 * ''Rhynchobatus australiae'' Whitley, 1939 (White-spotted Wedgefish) * ''Rhynchobatus djiddensis'' (Forsskål, 1775) (Giant guitarfish) * ''Rhynchobatus immaculatus'' Last, H. C. Ho & R. R. Chen, 2013 (Taiwanese wedgefish)〔Last, P.R., Ho, H.-C. & Chen, R.-R. (2013): (A new species of wedgefish, ''Rhynchobatus immaculatus'' (Chondrichthyes, Rhynchobatidae), from Taiwan. ) Pp. 185-198 in: de Carvalho, M.R., Ebert, D.A., Ho, H.-C. & White, W.T. (eds.) : Systematics and biodiversity of sharks, rays, and chimaeras (Chondrichthyes) of Taiwan. ''Zootaxa, 3752 (1): 1–386.''〕 * ''Rhynchobatus laevis'' (Bloch & J. G. Schneider, 1801) (Smoothnose wedgefish) * ''Rhynchobatus luebberti'' Ehrenbaum, 1915 (African wedgefish) * ''Rhynchobatus palpebratus'' Compagno & Last, 2008 (Eyebrow wedgefish) * ''Rhynchobatus springeri'' Compagno & Last, 2010 (Broadnose wedgefish) An additional species is known, the roughnose wedgefish (''Rhynchobatus sp. nov.'' A or 1), but it is still undescribed.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rhynchobatus」の詳細全文を読む スポンサード リンク
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