Heniochus singularius
The largest species of the genus Heniochus, found in the Indo-Pacific.
Heniochus singularius, known as the singular bannerfish, is a marine ray-finned fish belonging to the butterflyfish family Chaetodontidae. It is the largest species in its genus, reaching up to 30 centimeters in total length.
Juveniles and adults look quite different. Young fish have a long, white banner formed by the fourth spine of the dorsal fin, giving them a triangular shape. Adults have a shorter banner, making them appear fuller and more like typical butterflyfish. The body has a white band around the mouth, followed by several black bands: an eye stripe running from above the eye to the chin, a band across the middle of the body to the front of the dorsal fin, and a diagonal band from the soft-rayed part of the dorsal fin to the rear of the anal fin. The soft-rayed dorsal fin and the caudal fin are bright canary yellow. In adults, the area between the black bands has a fine reticulated pattern. A bony bump sits on the head. The dorsal fin has 11 to 12 spines and 25 to 27 soft rays; the anal fin has 3 spines and 17 to 18 soft rays.
This species has a wide Indo-Pacific range, from the Maldives and Chagos Islands east to Samoa, north to southern Japan, and south to northern Australia. In Australia, it appears from Shark Bay to the Dampier Archipelago and offshore reefs of Western Australia, along the northern Great Barrier Reef to Moreton Bay in Queensland, and at Christmas Island.
It lives on coastal, inner, and outer reef slopes, preferring areas with plenty of coral and varied topography. Juveniles are usually found in shallow lagoons, but may also occur in deeper water near caves and rock shelters. It feeds on coral polyps (possibly including live coral), benthic invertebrates, and algae. It is oviparous and breeds in pairs.
The species was first formally described in 1911 by American zoologists Hugh McCormick Smith and Lewis Radcliffe, with the type locality given as Alibijaban in Ragay Gulf, Luzon, Philippines.
Heniochus singularius is uncommon in the wild and also rare in the aquarium trade.
Quick Facts
- Taxon
- Heniochus singularius
Facts from the source article.
Lore & Background
Heniochus singularius was first formally described in 1911 by American zoologists Hugh McCormick Smith and Lewis Radcliffe, with the type locality given as Alibijaban in Ragay Gulf of Luzon in the Philippines. Adults and juveniles differ markedly in appearance: juveniles have the 4th spine of the spiny part of the dorsal fin elongated into a white banner, giving a triangular shape, while adults have a shorter banner and a fuller shape resembling typical butterflyfish. The colour pattern includes a white band around the mouth, several black bands (including an eye stripe from above the eye to the chin, a mid-body band to the front of the dorsal fin, and a diagonal band from the soft-rayed part of the dorsal fin to the rear of the anal fin), and bright canary yellow on the soft-rayed part of the dorsal fin and the caudal fin. Adults also have a fine reticulated pattern between the black bands and a bony bump on the head.
Reader's Guide
Heniochus singularius is found in the Indo-Pacific region, from the central Indian Ocean around the Maldives and Chagos Islands east to Samoa, north to southern Japan, and south to northern Australia, including Shark Bay, the Dampier Archipelago, the northern Great Barrier Reef, Moreton Bay in Queensland, and Christmas Island. It inhabits coastal, inner and outer reef slopes, preferring areas with plentiful coral growth and varied topography. Juveniles are typically found in shallow lagoons but may also occur in deeper water near caves and rock shelters. The species feeds on coral polyps (possibly including live coral), benthic invertebrates, and algae. It is oviparous and forms pairs to breed. Despite its wide distribution, it is uncommon in the wild and also uncommon in the aquarium trade.
Did You Know?
- Heniochus singularius is the largest species of the genus Heniochus, reaching 30 cm in total length.
- Juveniles have an elongated 4th dorsal spine forming a white banner, while adults have a shorter banner.
- It was first formally described in 1911 by Hugh McCormick Smith and Lewis Radcliffe.
- The species is uncommon both in the wild and in the aquarium trade.
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