- Speckled butterflyfish
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Speckled Butterflyfish 
Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Perciformes Family: Chaetodontidae Genus: Chaetodon (but see text) Subgenus: Exornator Species: C. (E.) citrinellus Binomial name Chaetodon (Exornator) citrinellus
Cuvier, 1831Chaetodon citrinellus is a species of butterflyfish (familyChaetodontidae). It is commonly known as the Speckled Butterflyfish or Citron Butterflyfish. It is found in the Indo-Pacific: the Red Sea, East Africa to the Hawaiian, Marquesan and Tuamotu islands, north to southern Japan and south to Australia.[1]
It is a distinct species, most closely related to the Four-spotted Butterflyfish (C. quadrimaculatus). Together they are basal in the subgenus Exornator, and might be intermediate between the core group of this subgenus and the species of the Rhombochaetodon (or Roaops) lineage. If that is correct, the latter would require to be merged into Exornator. If the genus Chaetodon is split up, Exornator might become a subgenus of Lepidochaetodon.[2][3]
Description and ecology
Speckled butterflyfish are often found in pairs.
As its names suggest, it is pale yellow with numerous small dark spots. There is also a black bar extending above and below the eye and a black margin to the anal fin. The largest recorded specimen was 13 centimeters (5.1 in) long.[1]
C. citrinellus is common in shallow exposed reef flats, lagoons, and seaward reefs, generally in relatively open areas with scattered corals. They may occasionally be found at greater depth, as deep as 36 meters (118 ft). They feed on small worms, small benthic invertebrates, coral polyps and filamentous algae.[1]
Adults usually swim in pairs (pairs form during breeding), while juveniles are more often seen in small aggregations and commonly mix with other similar sized juveniles, especially of the Sunburst Butterflyfish (C. kleinii). They are oviparous.[1]
Notes
- ^ a b c d Froese, Rainer, and Daniel Pauly, eds. (2006). "Chaetodon citrinellus" in FishBase. April 2006 version.
- ^ Fessler & Westneat 2007
- ^ Hsu, Chen & Shao 2007
References
- Fessler, Jennifer L.; Westneat, Mark W. (2007). "Molecular phylogenetics of the butterflyfishes (Chaetodontidae): Taxonomy and biogeography of a global coral reef fish family.". [[[Molecular Phylogenetics and Evolution|Mol. Phylogenet. Evol.]] 45 (1): 50–68. doi:10.1016/j.ympev.2007.05.018.
- Hsu, Kui-Ching; Chen, Jeng-Ping; Shao, Kwang-Tsao (2007). "Molecular phylogeny of Chaetodon (Teleostei: Chaetodontidae) in the Indo-West Pacific: evolution in geminate species pairs and species groups". Raffles Bulletin of Zoology Supplement 14: 77–86. http://rmbr.nus.edu.sg/rbz/biblio/s14/s14rbz10_Hsu-pp77-86.pdf.
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