Seychelles butterflyfish (Chaetodon madagaskariensis)

Classification (WoRMS)

Full classification as recorded by WoRMS: Kingdom: Animalia · Phylum: Chordata · Class: Teleostei · Order: Acanthuriformes · Family: Chaetodontidae · Genus: Chaetodon.

Accepted name: Chaetodon madagaskariensis · Authority: Ahl, 1923 · Taxonomic status: accepted · AphiaID: 218731.

Synonyms and superseded combinations recorded for this taxon: Chaetodon chrysurus Desjardins, 1834; Chaetodon chrysurus madagaskariensis Ahl, 1923; Chaetodon madagascariensis Ahl, 1923.

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=218731 (CC BY 4.0). Accessed 2026-09-23.

Biology and life history (FishBase)

Measured values published by FishBase for Chaetodon madagaskariensis. Only fields the database actually holds for this species are shown; these are database values, not aquarium guidance.

Maximum length: 13 cm · Depth range: 10–120 m · Habitat zone: reef-associated · Body shape: short and / or deep · Vulnerability index: 10 of 100 · Fishery importance: commercial · Aquarium trade: commercial.

FishBase notes: Found in outer reef habitats. Adults usually occurs in pairs (Ref. 48636). Oviparous (Ref. 205). Form pairs during breeding (Ref. 205).

Source: FishBase species summary (SpecCode 7793) — https://www.fishbase.se/summary/Chaetodon-madagaskariensis.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-23.

Distribution and occurrence records (GBIF)

467 georeferenced occurrence records for Chaetodon madagaskariensis are published through GBIF from 20 countries or marine areas. The map above plots 74 distinct locations from a sample of 467 records, omitting 4 inland records that carry an institution's coordinates rather than a collection site; it shows where the species has been observed and reported, not a modelled range.

Most records by country or area: Réunion (128); South Africa (89); Seychelles (60); Maldives (44); Mozambique (30); Mauritius (28); Mayotte (18); Tanzania, United Republic of (12); Kenya (9); India (8); Comoros (7); Madagascar (7); French Southern Territories (7); Egypt (5); British Indian Ocean Territory (4).

Marine regions with a valid WoRMS distribution record: Kenyan Exclusive Economic Zone; Somali Exclusive Economic Zone; Seychellois Exclusive Economic Zone; Réunion Exclusive Economic Zone; Mozambican Exclusive Economic Zone; Comoran Exclusive Economic Zone; Mauritian Exclusive Economic Zone; Tanzanian Exclusive Economic Zone; Madagascar; South Africa (country); Chagos.

Source: GBIF Occurrence Search (taxonKey 2385453) — https://www.gbif.org/occurrence/search?taxon_key=2385453&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=218731 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-23.

Conservation status (IUCN Red List)

The IUCN Red List assesses Chaetodon madagaskariensis Ahl, 1923 as Least Concern (code LC). No trend, population estimate or threat analysis is given here, because none is available from this source without the Red List API; follow the source link for the full assessment, including its date.

Source: IUCN Red List of Threatened Species (taxon 165642) — https://www.iucnredlist.org/species/165642/0; GBIF IUCN Red List category endpoint (taxonKey 2385453) — https://api.gbif.org/v1/species/2385453/iucnRedListCategory. Accessed 2026-09-23.

Description and natural history (Wikipedia)

It grows to a maximum of 13 cm (more than 5 in) long. The body color is silver at the head, becoming white towards the tail, with a triangular orange patch covering the posterior and the caudal peduncle. There are a series of dark grey chevron lines on the sides of the body, partly broken into spots. Between the eyes and the start of the dorsal fin there is a black patch rimmed with white. The base of the caudal fin is white, followed by an orange patch and a white rim.

The Seychelles butterflyfish was first formally described in 1923 by the German zoologist Ernst Ahl (1898-1945) with the type locality given as Mauritius. The specific name is sometimes spelt madagascarensis but Ahl's original should be used.

C. madagaskariensis is one of the "crowned" butterflyfishes. These form a group of largely allopatric species sharing the overall color pattern of dark forward-pointing chevrons on silvery hues, (usually) a black-and-white crown spot and yellow to red hindparts to a stunning degree; they differ in the exact combination of hues and some small pattern details. Other members of this lineage are the closely related Eritrean (C. paucifasciatus) and atoll butterflyfishes (C. mertensii), and the more distant pearlscale butterflyfish (C. xanthurus).

The "crowned" Chaetodon are a clearly recognizable clade, but their further relationships are otherwise less clear. They were often placed in the subgenus Exornator, or considered a distinct subgenus Rhombochaetodon. According to various DNA sequence studies, some older and more singular lineages. These include species such as the Asian butterflyfish (C. argentatus), the blue-striped butterflyfish (C. fremblii) and Burgess' butterflyfish (C. burgessi). C. burgessi is in fact so peculiar that it was placed in a monotypic subgenus Roaops. But recognition of this would probably result in several other small or monotypic subgenera becoming justified, and the older Rhombochaetodon would be the more conveniently apply to the entire radiation.

But the expanded group is of unclear relationships to species like the speckled butterflyfish (C. citrinellus) and the four-spotted butterflyfish (C. quadrimaculatus). These might be members of the subgenus Exornator – the lineages around the spot-banded butterflyfish (C. punctatofasciatus) – and C. citrinellus certainly looks somewhat similar to these. Yet phylogenetically, their position towards Rhombochaetodon is unresolved, and ultimately it might be better to merge both Rhombochaetodon and Roaops in Exornator. If the genus Chaetodon is split up, Exornator might become a subgenus of Lepidochaetodon or a separate genus.

Source: Wikipedia: Seychelles butterflyfish — https://en.wikipedia.org/wiki/Seychelles_butterflyfish (CC BY-SA 4.0). Accessed 2026-09-23.