Chaetodon mesoleucos
White-faced butterflyfish of the northwestern Indian Ocean.
Chaetodon mesoleucos, commonly called the white-faced butterflyfish, is a marine ray-finned fish in the family Chaetodontidae. Its front half is bluish white, with a vertical black band crossing the eye. The rest of the body is pale grey, marked with many vertical black lines. The tail fin is black, with a white patch on its inner edge near the tail base. This fish reaches a maximum total length of 13 cm, though 12 cm is more typical.
It lives in the northwestern Indian Ocean, from the central Red Sea into the Gulf of Aden and around Socotra. Found at depths between 1 and 25 meters, it inhabits coral reefs and usually swims in pairs. Its diet is thought to consist mainly of coral polyps, but it also eats various benthic invertebrates. Little else is known about its biology.
The species was first formally described in 1775 by Peter Forsskål, a Swedish-speaking Finnish explorer and naturalist; his description was published posthumously by Carsten Niebuhr, his companion on an expedition to Yemen. The type location is Al-Mukhā, Yemen. It belongs to the large subgenus *Rabdophorus*, which some experts consider distinct enough to be a separate genus.
The white-faced butterflyfish is uncommon in the aquarium trade, though it is not difficult to keep in captivity.
Quick Facts
- Genus
- Chaetodon
- Parent
- Chaetodon (Rabdophorus)
- Species
- mesoleucos
Facts from the source article.
Lore & Background
Chaetodon mesoleucos was first formally described in 1775 by the Swedish-speaking Finnish explorer and naturalist Peter Forsskål, with the description published posthumously by his expedition companion Carsten Niebuhr. The type locality is Al-Mukhā in Yemen. It belongs to the large subgenus Rabdophorus, which might warrant recognition as a distinct genus.
The species has a bluish white anterior body with a vertical black band through the eye, while the rest of the body is pale grey with numerous vertical black lines. The caudal fin is black with a white inner margin near the caudal peduncle. It attains a maximum total length of 13 cm, though 12 cm is more common.
Chaetodon mesoleucos occurs at depths between 1 and 25 meters, inhabiting coral reefs where they occur in pairs. They are thought to feed mainly on coral polyps but will eat a variety of benthic invertebrates. Little is known about the biology of this species.
Reader's Guide
Chaetodon mesoleucos is found in the northwestern Indian Ocean, from the central Red Sea into the Gulf of Aden and around Socotra. Its distribution is limited to this region, making it a geographically restricted species. In the aquarium trade, it is uncommon but not difficult to keep in captivity, suggesting it may be of interest to specialized hobbyists. The species' reliance on coral polyps as a primary food source ties its ecology to the health of coral reefs, though detailed biological knowledge remains scarce. Its placement within the subgenus Rabdophorus, which might warrant recognition as a distinct genus, indicates ongoing taxonomic discussion. The species' description by Forsskål, published posthumously by Niebuhr, highlights its historical significance as part of early naturalist exploration of Yemen. Overall, Chaetodon mesoleucos represents a modestly known butterflyfish with limited distribution and aquarium presence, contributing to the diversity of the Chaetodontidae family in the Indian Ocean.
Did You Know?
- Chaetodon mesoleucos was first described in 1775 by Peter Forsskål, with the description published by Carsten Niebuhr.
- It occurs at depths between 1 and 25 meters on coral reefs.
- The species is uncommon in the aquarium trade but not difficult to keep in captivity.
Frequently Asked Questions
What is Chaetodon mesoleucos?
Chaetodon mesoleucos is a small marine butterflyfish in the family Chaetodontidae, widely known by its common name, the white-faced butterflyfish. It was first formally described by Peter Forsskål in 1775, with the type locality recorded as Al-Mukhā, Yemen.
What does Chaetodon mesoleucos look like?
The front half of the body is bluish white with a bold vertical black band crossing the eye, while the rear half is pale grey streaked with numerous vertical black lines. The tail fin is solid black and features a small white patch along its inner edge near the base.
Where can you find Chaetodon mesoleucos in the wild?
This species is restricted to the northwestern Indian Ocean, occurring from the central Red Sea through the Gulf of Aden and around Socotra. It is typically encountered at depths ranging from 1 to 25 meters (about 3 to 82 feet).
How large does Chaetodon mesoleucos grow?
The white-faced butterflyfish reaches a maximum total length of roughly 13 cm (5.1 in), although most individuals in the wild are closer to 12 cm (4.7 in). It remains a relatively small member of the butterflyfish family.
Who first described Chaetodon mesoleucos and when?
Peter Forsskål, the 18th-century Swedish naturalist, originally described the species in 1775. The type locality associated with that description is Al-Mukhā, Yemen.
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