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Blackwedged butterflyfish
The blackwedged butterflyfish (''Chaetodon falcula'') is a species of butterflyfish (family Chaetodontidae). It is found in the Indian Ocean, from eastern Africa south to 27°S and east to Indonesia.〔 (): (''Chaetodon falcula'' ). Retrieved 2008-SEP-01.〕
It grows to a maximum of 20 cm (nearly 8 in) long. Its shape is reminiscent of longsnout butterflyfish, though the snout is not as extremely prolonged and the pattern is very different. The body is white with a series of narrow vertical dark grey lines and bright yellow and orange over the back, dorsal fin, anal fin and caudal fin. There are two well-defined black saddles on the back, and as usual the characteristic black eye-band of ''Chaetodon'' is present.〔
The blackwedged butterflyfish is found on the reef edge and upper slope. It prefers current-prone habitats 1-20 m deep. It mainly feeds on invertebrates.〔
It belongs to the large subgenus ''Rabdophorus'' which might warrant recognition as a distinct genus. In this group, the closest relative of this peculiar species is the similar-looking Pacific double-saddle butterflyfish or "false falcula", ''C. ulietensis''. Other fairly close relatives are the quite differently-shaped but similarly colored lined (''C. lineolatus'') and spot-naped butterflyfishes (''C. oxycephalus''), while the blue-cheeked butterflyfish (''C. semilarvatus'') seems to be a far more basal lineage relative to all of these. The bluish vertical lines are present in all of these, while a white body with yellow behind and black on back and caudal peduncle are only shared among the four less ancient species.〔 (2007): Molecular phylogenetics of the butterflyfishes (Chaetodontidae): Taxonomy and biogeography of a global coral reef fish family. ''Mol. Phylogenet. Evol.'' 45(1): 50–68. (HTML abstract)〕〔 (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. (PDF fulltext )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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