Gonochaetodon triangulum   (Cuvier)  1831 (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Size: 12 cm.

Color: Dark brown, paler on head and chest, an ocular band curves from the two anterior dorsal spines to base of ventral, before it a frontal stripe comprising snout, behind it a third narrow band from spinous dorsal across operculum to belly. Sides of body with alternating, angularly bent dark brown and whitish bands, more diffuse on posterior part of body, soft dorsal and anal dark brown, outwards reddish, as also caudal peduncle, their margin lighter with a submarginal dark line, caudal blackish encircle by yellow, pectorals and ventrals whitish. In two color varieties from the Red Sea: only the ocular band is present in G. triangulum var. karraf C.V., while otherwise the greater part of head and chest is brownish red, in var. larvatus Ehrenberg only the las named color is present and even the ocular band is wanting.

Height 1.25-1.4, head 3-3.5 in length, head slightly shorter than high, rostro-dorsal profile steeply ascending with a concavity before eye. Eye 2.7 to more than 3, equal to or slightly longer than snout and somewhat greater than convex interorbital space, preoperculum indistinctly denticulate. Spinous dorsal slightly longer than soft, last spine subsequal to head without snout, about sixth, seventh and eighth ray forming a rounded angel on border of fin, the highest equal to head or even longer. Last anal spine longest, nearly equal to last dorsal spine, soft anal somewhat less elevated, rounded. Pectorals pointed, nearly equal to head, ventrals acute, the first prolonged ray nearly reaching anal, its spine about equal to head without snout. Caudal truncate or slightly convex. least height of its strongly compressed peduncle equal to eye. For other characters see diagnosis of genus.

Remarks: Values in above description denote proportions.

Synonym (s)
Chaetodon triangulum Cuvier and Valenciennes 1831
Chaetodon baronessa Cuvier and Valenciennes
Chaetodon baronessa Bleeker 1851
Chaetodon baronessa Gunther 1860
Citharoedus triangulum Kaup 1860
Sarothrodus baronessa Bleeker 1863
Tetragonoptrus baronessa Bleeker
Tetragonoptrus (Gonochaetodon) triangulum Bleeker 1877
Chaetodon baronessa Macleary 1882
Chaetodon triangulum Meyer 1885
Chaetodon baronessa Meyer
Chaetodon triangulum Alcock 1896
Chaetodon triangulum Steindachner 1900
Gonochaetodon triangulum Jordan and Seale 1906
Chaetodon triangulum M. Weber 1913
Chaetodon triangulum Ahl 1923
Chaetodon triangulum Ahl
Gonochaetodon triangulum McCulloch 1926
Chaetodon (Gonochaetodon) triangulum Herre and Montalban 1927
Chaetodon baronessa Fowler 1928
Chaetodon triangulum Fowler and Bean 1929
Gonochaetodon triangulum Herre 1931

Common Name (s)
Economic Importance and Threats



• Andaman and Nicobar Islands, Andamans INDIA (Record: 1936)

Literature Source(s)
  • 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
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org

Page last updated on:2009-08-31

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