Redescription of Iniistius jacksonensis (Ramsay 1881) and description of Iniistius opalus sp. nov. from northern Australia (Perciformes: Labridae)

Abstract

The razorfish Iniistius jacksonensis (Ramsay 1881) is redescribed based on 10 specimens, including adult individuals, from eastern Australia. A second Australian species, Iniistius opalus sp. nov. is described based on 16 specimens from northern waters. Both species can be distinguished from other congeners in having a broad band of small scale rows on the cheek, a single small scale below the eye, first two dorsal-fin spines short, their length similar to those of other spines of dorsal fin, central gill-raker of lower limb of first gill arch with a single branch, greater body depth [33.6–41.5% standard length (SL) in Iniistius jacksonensis, versus 33.5–39.2% SL in I. opalus sp. nov.], and several small blotches on the anal-fin base. The new species can be distinguished from I. jacksonensis by its 10 scale rows below lateral line, four branches on central gill-raker of first upper limb of gill arch (vs. 2 branches in latter), greater head length [32.9–36.0% (mean 34.3%) vs. 29.6–32.1% (31.2%) SL], pre-pectoral-fin length [29.8–32.5% (31.2%) vs. 26.5–29.9% (28.5%) SL], orbit diameter [6.1–7.3% (6.8%) vs. 5.0–6.8% (5.8%) SL] and postorbital length [14.9–18.4% (16.8%) vs. 13.6–16.2% (14.9%) SL], and small blotches on head (vs. no blotches).

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Acknowledgements

I am especially grateful to M. McGrouther (AMS) for opportunities to examine specimens and providing information on the Australian record of I. jacksonensis, A. Graham (CSIRO) for opportunities to examine specimens and providing color photographs of the holotype of I. opalus sp. nov., A. Hay and S. Reader (AMS), A. Suzumoto, L. O’Hara, J. Randall and R. Pyle (BPBM), M. Nakae (NSMT), J. Johnson (QM), G. Moore and M. Allen (WAM) for providing opportunities to examine specimens, G. Hardy (Ngunguru, New Zealand) for reading the manuscript and providing help with English, and M. Gomon (NMV) and the anonymous reviewer for reviewing the manuscript and providing valuable comments. I also thank H. Motomura (KAUM), M. Gomon (NMV), M. Matsunuma (KUN), Y. Sakurai (Okinawa, Japan), M. Itou, Y. Haraguchi and M. Takayama, and students and other volunteers of KAUM, and H. Fukui and M. Fukui (Kagoshima, Japan) for their kind support throughout this study. This study is supported in part by a Grant-in-Aid from the Japan Society for the Promotion of Science for JSPS Fellows (DC2: 17J05261).

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Correspondence to Yoshino Fukui.

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This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as 88BAE7BB-F9C0-4456-AF08-2E0822CE9F5D.

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Fukui, Y. Redescription of Iniistius jacksonensis (Ramsay 1881) and description of Iniistius opalus sp. nov. from northern Australia (Perciformes: Labridae). Ichthyol Res 66, 258–268 (2019). https://doi.org/10.1007/s10228-018-0673-0

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Keywords

  • Wrasse
  • Morphology
  • New species
  • Distribution