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Acropora polystoma
''Acropora polystoma'' is a species of acroporid coral that was first described by G. Brook in 1891. Found in marine, tropical, reefs on upper slopes where waves are strong, it occurs at deppths between . It is classed as a vulnerable species on the IUCN Red List, and it has a decreasing population. It is not common and found over a large area and is classified under CITES Appendix II.
==Description==
''Acropora polystoma'' is found in colonies of clumps or of corymbose plates〔(【引用サイトリンク】title=''Acropora polystoma'' Fact Sheet. (Brook, 1891) )〕 with diameters not exceeding .〔 The branchlets have lengths of up to and diameters of between . It is blue, cream, yellow, lavender, or brown in colour, and the branches are similar in size and become thinner towards the ends.〔〔 The branches contain axial and radial corallites. Axial corallites are located on the ends of the branch tips, and are small with outer diameters of between and inner diameters of .〔〔 Radial corallites are regularly arranged and found in rows, and are tube-shaped.〔 It contains a small number of randomly positioned spinules.〔 It is similar to ''Acropora massawensis''〔 and other species of the ''robusta'' group.〔 It is found in marine environments in tropical, shallow reefs, at depths between . It occurs on slopes of reefs damaged by strong waves, and reef edges.〔(【引用サイトリンク】title=''Acropora polystoma'' )〕 It is composed of aragonite (calcium carbonate).〔(【引用サイトリンク】title=Measurements and facts about ''Acropora polystoma'' )〕
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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