Florent's Guide To The

Tropical Reefs

Atoll Butterflyfish
Chaetodon mertensii
Atoll Butterflyfish
Also known as: Mertens' Butterflyfish
Category: Butterflyfishes
Scientific Name: Chaetodon mertensii
Size: Up to 5 in. (13 cm)  
Depth: 30-300 ft. (10-90 m)
Distribution: West Pacific, French Polynesia, Great Barrier Reef, Fiji
Chordata (Phylum)
└Osteichthyes (Parvphylum)
 └Actinopterygii (Gigaclass)
  └Actinopteri (Superclass)
   └Teleostei (Class)
    └Acanthuriformes (Order)
     └Chaetodontidae (Family)
      └Chaetodon (Genus)

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© 2025 Florent Charpin