Foureye butterflyfish (Chaetodon capistratus)

Classification (WoRMS)

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

Accepted name: Chaetodon capistratus · Authority: Linnaeus, 1758 · Taxonomic status: accepted · AphiaID: 159661.

Synonyms and superseded combinations recorded for this taxon: Chaetodon bricei Smith, 1898.

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=159661 (CC BY 4.0). Accessed 2026-09-23.

Biology and life history (FishBase)

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

Maximum length: 15 cm · Depth range: 2–20 m · Habitat zone: reef-associated · Body shape: short and / or deep · Vulnerability index: 10 of 100 · Fishery importance: commercial · Aquarium trade: commercial.

FishBase notes: Inhabit shallow reefs and generally occurs singly or in pairs. Feed mainly on zoantharians, polychaete worms, gorgonians and tunicates. Easily approached (Ref. 9710). Oviparous (Ref. 205). Form pairs during breeding (Ref. 205).

Source: FishBase species summary (SpecCode 3602) — https://www.fishbase.se/summary/Chaetodon-capistratus.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-23.

Distribution and occurrence records (GBIF)

42,166 georeferenced occurrence records for Chaetodon capistratus are published through GBIF from 41 countries or marine areas. The map above plots 141 distinct locations from a sample of 3,000 records, omitting 32 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: United States of America (30,405); Puerto Rico (3,442); Virgin Islands (U.S.) (2,249); Colombia (2,179); Mexico (933).

The full country table, WoRMS marine regions and the sampling notes are on this species' Distribution page.

Source: GBIF Occurrence Search (taxonKey 2385548) — https://www.gbif.org/occurrence/search?taxon_key=2385548&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=159661 (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 capistratus Linnaeus, 1758 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 165695) — https://www.iucnredlist.org/species/165695/0; GBIF IUCN Red List category endpoint (taxonKey 2385548) — https://api.gbif.org/v1/species/2385548/iucnRedListCategory. Accessed 2026-09-23.

Description and natural history (Wikipedia)

Chaetodon capistratus is the type species of Chaetodon. Hence, if this genus is split up as some have proposed, it will retain its present binomial name along with its closest relatives, which include the banded butterflyfish (C. striatus) and the spot-finned butterflyfish (C. ocellatus).

The foureye butterflyfish is deep-bodied and laterally compressed, with a single dorsal fin and a small mouth with tiny, bristle-like teeth. The body is light grey, sometimes with a yellowish hue, on which there are many forward-pointing dark chevrons. At the rear portion of each side of the body, the chevrons are replaced by a white-margined black ocellus (which is vertically oval in juveniles and more circular in adults); this feature leads to the common name of this species. The two ocelli are much more visible than the true eyes, which are smaller and are run through by a black vertical bar. Similar to the other butterflyfish species with the ocellus feature, this pattern is an instance of automimicry, and is designed to disorientate predators and make them think that the rear of the fish is actually the front.

Other potential functions of the ocelli may exist. These include: intimidating prey, altering predation reaction distances, serving as a general warning and social communication.

The foureye butterflyfish is known for its uncanny ability to swim in and around coral heads and reefs, being able to find its way through the most intricate passages by swimming on its side or even upside down.

When escape is not possible, the foureye butterflyfish will sometimes turn to face its predator, head lowered and spines fully erect, like a bull about to charge. This may serve to intimidate the predator or to remind it that the butterflyfish is much too spiny to make a comfortable meal.

The foureye butterflyfish usually frequents shallow inshore waters, where it feeds on a variety of invertebrates, mainly zoantharians, sea anemones, scleractinians, polychaete worms, gorgonians, tunicates and crustaceans. It may also eat fish eggs. Like its relatives, the foureye butterflyfish mates for life, and so is often seen in pairs. This behavior is rare among fishes.

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