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Revision of the wobbegong genus Orectolobus from Japan, with a redescription of Orectolobus japonicus (Elasmobranchii: Orectolobiformes)

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Abstract

The wobbegong genus Orectolobus occurring from Japan and its adjacent waters was reviewed, and O. japonicus was redescribed using ten specimens including a syntype. Only one species, O. japonicus, was regarded as valid among three species previously recorded from Japan. Orectolobus maculatus had been erroneously described from Japan because of the past nomenclatural confusion with O. japonicus. The specimen called “Karakusa-oose,” which had been identified with O. ornatus, was regarded as an irregular form of O. japonicus. Orectolobus japonicus was distinguished from the other congeners by having no tubercles on the body, five to eight dermal lobes in the preorbital group, two distally notched lobes in the postspiracular group, no dermal lobes on lower jaw, nasal barbel with a branch, no supraocular knob, relatively high dorsal fins with usually concave posterior margins, a lower number of precaudal vertebrae and intestinal valve turns, saddles on the back without black borders and yellowish and variously shaped blotches, not forming white O-shaped spots.

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Acknowledgments

I sincerely thank P. R. Last (CSIRO) and S. M. Shirai (Japan Sea National Research Institute) for their critical reading and useful comments on the draft manuscript. I express sincere thanks to K. Amaoka (formerly HUMZ) and K. Nakaya (HUMZ) for their suggestions for this work, N.R. Merrett (BMNH), B. Seret (MNHN), C. Araga (SMBL), K. Smith (WAM) and J.R. Paxton (AMS) for the loan of material and H. Endo (BSKU) for his support with measurements of the BSKU material.

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Correspondence to Tomoaki Goto.

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Goto, T. Revision of the wobbegong genus Orectolobus from Japan, with a redescription of Orectolobus japonicus (Elasmobranchii: Orectolobiformes). Ichthyol Res 55, 133–140 (2008). https://doi.org/10.1007/s10228-007-0033-y

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  • DOI: https://doi.org/10.1007/s10228-007-0033-y

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