The halfbanded angelfish (Genicanthus semicinctus) is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the southwestern Pacific Ocean.
| Halfbanded angelfish | |
|---|---|
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Acanthuriformes |
| Family: | Pomacanthidae |
| Genus: | Genicanthus |
| Species: | G. semicinctus
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| Binomial name | |
| Genicanthus semicinctus (Waite, 1900)
| |
| Synonyms[2] | |
|
Holocanthus semicinctus Waite, 1900 | |
Description
editGenicanthus semicinctus like the other angelfishes in the genus Genicanthus, shows sexual dichromatism, the males and females show differences in colour and pattern. The males are marked with thin close-set wavy black, vertical bars which run from the back to two-thirds down the flanks with the lower third of the body being yellowish-orange. They have a yellow dorsal fin and yellow lobes with long filaments on the caudal fin which has black spots. The chest also has black spots. The females are plain dark grey on the back with a whitish abdomen and have dark lobes to the caudal fin. Their fins have thin blue margins and there is a black blotch above the eye, this has a vivid blue margin.[3] The dorsal fin contains 15 spines and 15-16 soft rays while the anal fin has 3 spines and 17 soft rays. This species attains a maximum total length of 21 centimetres (8.3 in).[2]
Distribution
editGenicanthus semicinctus is found in the southwestern Pacific Ocean. Here it is found only around Lord Howe Island, an Australian territory in the Tasman Sea, and the New Zealand outlying islands of the Kermadec Islands.[1]
Habitat and biology
editGenicanthus semicinctus is found at depths between 10 and 100 metres (33 and 328 ft).[1] it is found on the deep outer slopes of coral and rocky reefs. It normally occurs in small groups, harems of a male and as many as 4 females. This species is a protogynous hermaphrodite and if the male in a group disappears the dominant female will change into a male, this change takes a few weeks.[3]
Systematics
editGenicanthus semicinctus was first formally described as Holocanthus semicinctus in 1900 by the British-born Australian ichthyologist Edgar Ravenswood Waite (1866–1928) with the type locality given as Lord Howe Island.[4] The specific name is a compound of semi meaning “half” and cinctus meaning “bands”.[5]
Utilisation
editGenicanthus semicinctus is very rare in the aquarium trade.[1]
References
edit- ^ a b c d Pyle, R. & Myers, R.F. (2020) [amended version of 2010 assessment]. "Genicanthus semicinctus". IUCN Red List of Threatened Species. 2020: e.T165866A177436288. doi:10.2305/IUCN.UK.2020-3.RLTS.T165866A177436288.en. Retrieved 20 February 2021.
- ^ a b Froese, Rainer; Pauly, Daniel (eds.). "Genicanthus semicinctus". FishBase. December 2019 version.
- ^ a b Bray, D.J. (2020). "Genicanthus semicinctus". Fishes of Australia. Museums Victoria. Retrieved 20 February 2021.
- ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Genicanthus". Catalog of Fishes. California Academy of Sciences. Retrieved 19 February 2021.
- ^ Christopher Scharpf & Kenneth J. Lazara (21 July 2020). "Order ACANTHURIFORMES (part 1): Families LOBOTIDAE, POMACANTHIDAE, DREPANEIDAE and CHAETODONTIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf and Kenneth J. Lazara. Retrieved 19 February 2021.