The Threadfin Emperor's second dorsal fin spine is longer than the other dorsal spines. The fish is normally light brown to greenish above and pale below often with 2 or 3 brown lines. The sides have oblique brownish bars and a square black blotch above the pectoral fin.
It lives in sandy or rocky areas and in seagrass beds. The species is known from estuarine and inshore areas.
The Threadfin Emperor occurs primarily in tropical waters of the east-Indo-west Pacific region.
The map below shows the Australian distribution of the species based on public sightings and specimens in Australian Museums. Click on the map for detailed information. Source: Atlas of Living Australia.
- Hoese, D.F., Bray, D.J., Paxton, J.R. & G.R. Allen. 2006. Fishes. In Beesley, P.L. & A. Wells. (eds) Zoological Catalogue of Australia. Volume 35. ABRS & CSIRO Publishing: Australia. parts 1-3, pages 1-2178.
- Randall, J.E., Allen, G.R. & R.C. Steene. 1997. Fishes of the Great Barrier Reef and Coral Sea. Crawford House Press. Pp. 557.