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Acropora horrida
''Acropora horrida'' is a species of acroporid coral that was first described by James Dwight Dana in 1846. Found in tropical, shallow reefs in marine environments, it occurs near fringing reefs around turbid water, at depths of . It is listed as a vulnerable species on the IUCN Red List, and it is thought to have a decreasing population. It is not common and found over a large area, and is listed under CITES Appendix II.
==Description==
''Acropora horrida'' forms in colonies, which are mainly open branched.〔(【引用サイトリンク】title=''Acropora horridia'' Fact Sheet. (Dana, 1846) )〕 It is light blue, dark blue, light yellow, or brown in colour, with white or pale blue polyps. The main branches contain an unorganised structure of branchlets, based on examples in water showing turbidity. However, in clear water, the branchlets are short, making the structure appear bristly. The corallites are rough and irregularly placed, and tentacles enlarge during the day. There are no similar species within genus ''Acropora''.〔 It is found in marine, tropical, shallow reefs, mainly in turbid water near fringing reefs. It also occurs in shallow lagoons and sand slopes, and is found at depths of between . It is believed to survive for more than ten years, and reaches maturity at between three and eight.〔(【引用サイトリンク】title=''Acropora horrida'' )〕 It is composed of aragonite (calcium carbonate).〔(【引用サイトリンク】title=Measurements and statistics about ''Acropora horrida'' )〕
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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