Raggedfin Parrotfish, Chlorurus rhakoura Randall & Anderson 1997


A Raggedfin Parrotfish, Chlorurus rhakoura, at Cape Preston, north Western Australia, May 2016. Source: Tony Ayling / iNaturalist.org. License: CC By Attribution-NonCommercial

Summary:
A deep purplish to greyish-brown parrotfish with bright blue margins on the dorsal and anal fins, a bulbous fleshy protuberance on the forehead of adults, excised rays on the caudal fin giving the fin margin a 'ragged' appearance, a scalloped margin on the pectoral fin, and a very long second-last dorsal- and anal-fin ray. The species also has conspicuous white dental plates (fused teeth), with the lips covering only about one-quarter of the teeth. 
Smaller fish have dull bluish-green body scales with a pinkish to purplish bar on each scale.

Cite this page as:
Bray, D.J. 2021, Chlorurus rhakoura in Fishes of Australia, accessed 02 Dec 2021, https://fishesofaustralia.net.au/home/species/4933

Raggedfin Parrotfish, Chlorurus rhakoura Randall & Anderson 1997

More Info


Distribution

Recorded in the Australia region from Exmouth to Geographe Shoals, Western Australia. Elsewhere the species occurs in the Mediterranean Sea (Sicily) and the Indian Ocean: Bangladesh, Sri Lanka, Andaman Sea and Indonesia.
Individuals or small schools inhabit inshore reefs in areas of high coral cover.

Features

Dorsal fin IX,10; Anal rays III, 9 (first spine very small and slender); Pectoral fin 14-15, the uppermost ray rudimentary, the second unbranched; Pelvic fin 1,5; Caudal fin (principal rays) 13, the upper and lower unbranched; procurrent caudal rays (upper and lower) 6; Longitudinal scale series 23; Lateral line interrupted but overlapping, the dorsoanterior part with 19 (19-20) scales, and the peduncular part with 5 (5-6) scales; 3 median predorsal scales, 2 rows of scales on cheek.
Caudal-fin rays strongly excised giving the fin a ragged appearance, penultimate anal-fin ray relatively elongate. 

Colour

Dark greyish-brown, body scales a dull bluish-green with very dark purplish edges; or body deep blue, scales greenish with a narrow orange-red bar at base; margins of dorsal and anal fins bright blue.

Similar Species

Similar to the Knothead ParrotfishChlorurus oedema, which may or may not occur in Australia. The Knothead Parrotfish has a rounded tail without 'ragged' fin rays.

Etymology

The specific name rhakoura is from the Greek rhakos (= rag) and oura (= tail), in reference to the ragged posterior margin of the caudal fin.

Species Citation

Chlorurus rhakoura  Randall & Anderson 1997, Journal South Asian Natural History 2(2): 157, Figs. 1-5, Trincomalee, off Lively Rocks, Sri Lanka, depth 20 m.

Author

Bray, D.J. 2021

Resources

Atlas of Living Australia

Raggedfin Parrotfish, Chlorurus rhakoura Randall & Anderson 1997

References


Allen, G.R. & Erdmann, M.V. 2012. Reef fishes of the East Indies. Perth : Tropical Reef Research 3 vols, 1260 pp.

Choat, J.H., Carpenter, K.E., Clements, K.D., Rocha, L.A., Russell, B., Myers, R., Lazuardi, M.E., Muljadi, A., Pardede, S. & Rahardjo, P. 2012. Chlorurus rhakoura. The IUCN Red List of Threatened Species 2012: e.T190767A17775837. https://dx.doi.org/10.2305/IUCN.UK.2012.RLTS.T190767A17775837.en. Downloaded on 16 December 2019.

Choat, J.H, Klanten, O.S., van Herwerden, L., Robertson, D.S. & Clements, K.D. 2012. Patterns and processes in the evolutionary history of parrotfishes (Family Labridae). Biological Journal of the Linnean Society 107(3): 529-557 https://doi.org/10.1111/j.1095-8312.2012.01959.x

Hasan, M.E. & Parvej, M.R. 2020. Range extension of parrotfishes Scarus zufar and Chlorurus rhakoura (Teleostei: Scarinae) to Bay of Bengal, Bangladesh. Journal of the Ocean Science Foundation 36: 84–90 https://doi.org/10.5281/zenodo.4399975

Hutchins J.B. 2004. Fishes of the Dampier Archipelago, Western Australia. Records of the Western Australian Museum Supplement 66: 343–39.

Insacco, G. & Zava, B.M. 2017. Chlorurus rhakoura Randall & Anderson, 1997 (Perciformes, Scaridae), an Indo-Pacific fish new to the Mediterranean Sea. Mediterranean Marine Science 18(2): 285-291 http://dx.doi.org/10.12681/mms.2139

Randall, J.E. & Anderson, R.C. 1997. Chlorurus rhakoura, a new species of parrotfish (Perciformes: Labroidei: Scaridae) from Sri Lanka. Journal of South Asian Natural History 2(2): 155-164 https://doi.org/10.12681/mms.2139

Smith, L.L., Fessler, J.L., Alfaro, M.E., Streelman, J.T. & Westneat, M.W. 2008. Phylogenetic relationships and the evolution of regulatory gene sequences in the parrotfishes. Molecular Phylogenetics and Evolution 49: 136-152.

Westneat, M.W. & Alfaro, M.E. 2005. Phylogenetic relationships and evolutionary history of the reef fish family Labridae. Molecular Phylogenetics and Evolution 36: 370–390.

Quick Facts


CAAB Code:37386037

Biology:Hermaphrodite

Conservation:IUCN Least Concern

Depth:1-30 m

Habitat:Reef associated

Max Size:44 cm SL

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Species Maps

CAAB distribution map