Heniochus monoceros   Cuvier,  1831 (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Image copyrights: Randall, J.E.

Size: 22.6-24 cm.

Color: Pale brownish or yellowish, a blackish narrow band from origin of dorsal covering front part of head including orbit, chin and muzzle, leaving the lips white, a second transverse band from fifth to seventh dorsal spine, getting broader while descending to belly and reaches from origin of ventral to vent. A similar band, narrower and less defined, descends from the hind part of spinous dorsal to posterior half of soft anal, interorbital space whitish. Remaining parts of dorsal and anal more or less yellowish as also pectorals and caudal, ventrals black.

Height more or less than 2, head about 3 in length, its rostro-dorsal profile concave till median protuberance, thence convex till dorsal. Snout prominent, longer than eye, which goes 2.75 to 3 times in head and is somewhat longer than slightly convex inter-orbital space. Above each eye a rather small osseous protuberance. Spinous dorsal strongly convex, longer than strongly rounded soft dorsal, fourth dorsal spine produced into a long filament about length of body, its broad membrane only in about lower two third developed, sequent graduated, lower than dorsal rays. Anal angulate, its spines strong, the second and third sub-equal, much longer than first. Pectorals acute, about equal to head, ventrals slightly shorter, their spine longer than head without snout. Caudal truncate or slightly emarginate, least height of its peduncle about equal to or somewhat more than eye. A pair of bony knobs is on the forehead. Juveniles of this species resemble juveniles of Heniochus singularis and may be differentiated by the position of the middle black band that passes behind the white pennant in Heniochus monoceros and in front of it in Heniochus singularis. Adults with short banner. Dorsal spines (total): 12; Dorsal soft rays (total): 24-27; Anal spines: 3; Anal soft rays: 17-19.

Oviparous, dioecious, internal (oviduct) fertilization. Form pairs during breeding.

Remarks: Values in above description denote proportions.

Synonym (s)
Heniochus monoceros Cuvier, 1831
(Senior synonym)
Taurichthys monoceros (Cuvier, 1831)
(Senior synonym)
Heniochus monoceros Bleeker, 1850
Heniochus macrolepidotus Brevoort, 1856
Heniochus monoceros Gunther, 1875
Taurichthys monoceros Bleeker, 1878
Heniochus monoceros Sauvage, 1891
Heniochus monoceros Jordan and Seale, 1906
Heniochus monoceros Kendall and Radcliffe, 1912
Loa excelsa Jordan, 1921
Roa excelsa Jordan, 1923
Heniochus monoceros Ahl, 1923
Heniochus monoceros Fowler, 1928
Heniochus monoceros Fowler and Bean, 1929
Heniochus monoceras Cuvier, 1831

Common Name (s)
• Masked Bannerfish (English)
• Didanegi (Mahl)
Economic Importance and Threats
Importance:  Commercial
(Aquarium, ornamental fish)

Habitat:  Reef Associated
Trophic Level:  Consumer
Prey:  Invertebrates associated with algal zones


• Lakshadweep, Kavaratti Atoll (Lat: 10.55) (Long: 72.63) INDIA (Record: 01/1991-06/1992)
• Lakshadweep, Minicoy INDIA
• Lakshadweep INDIA
• Lakshadweep Islands INDIA (Record: 11/1993-01/1997)
• Lakshadweep, Minicoy Island (Lat: 8.11) (Long: 73.3) INDIA

Literature Source(s)
  • Anand, PEV and Pillai, NGK (2003) Habitat distribution and species diversity of coral reef fishes in the reefslope of the Kavaratti atoll, Lakshadweep, India Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin 45(1) 88-98 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Froese, R and Pauly, D (2000) Fishbase 2000: Concepts, design and data sources ICLARM 344 pp Available at - http://www.fishbase.org
  • Weber, M; Beaufort, LF (1936) The fishes of the Indo-Australian Archipelago Print times, Pataudi house, Daryaganj, New Delhi 7 607 pp Available at - NIO, Goa
  • Jones, S and Kumaran, M (1980) Fishes of the Laccadive Archipelago The Nature Conservation and Aquatic Sciences Service, Trivandrum, Kerala 760 pp Available at - NIO, Goa
  • Fischer, W and Bianchi, G (Eds.) (1984) FAO species identification sheets for fishery purposes. Western Indian Ocean; (Fishing area 51). FAO, Rome 1 Available at - http://www.fao.org/docrep/009/ad468e/ad468e00.HTM#Contents
  • Jones, S and Kumaran, M (1965) New records of fishes from the seas around India - Part III Journal of the Marine Biological Association of India Marine Biological Association of India 7(2) 381-400 Available at - http://eprints.cmfri.org.in/1855/1/Jones_381-400.pdf
  • Jones, S. (1969) Catalogue of fishes from the Laccadive Archipelago in the reference collections of the Central Marine Fisheries Research Institute. Bulletin of Central Marine Research Institute CMFRI, Cochin 8 1-35 Available at - http://eprints.cmfri.org.in/569/1/Bulletin_8.pdf
  • Murty, VS (2002) Marine ornamental fish resources of Lakshadweep CMFRI Special Publication CMFRI 72 1-134 Available at - http://eprints.cmfri.org.in/3536/1/Special_Publication_No_72.pdf
  • Jones, S and Kumaran, M (1959) The fishing industry of Minicoy Island with special reference to the tuna fishery Indian Journal of Fisheries Indian Council of Agricultural Research 6 (1) 30-57 Available at - http://eprints.cmfri.org.in/1866/1/Article_04.pdf

Page last updated on:2011-06-02

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