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==Anatomy==
[[File:Luidia ciliaris, Ras Sedr,Egypt.jpg|thumbnail|<!--image is misnamed on Commons-->''[[Luidia maculata]]'', a seven armed starfish]]
Most starfish have five arms that radiate from a central disc, but the number varies with the group. ''[[Luidia ciliaris]]'' has seven arms, members of the [[Solasteridae]] have ten to fifteen while the Antarctic ''[[Labidiaster annulatus]]'' can have up to fifty. It is not unusual in species that typically have five arms for some individuals to possess six or more through abnormal development.<ref>{{cite web | url=http://www.dailymail.co.uk/sciencetech/article-1222404/Starfish-record-eights-legs-British-coast.html | title=You superstar! Fisherman hauls in starfish with eight legs instead of five | publisher=''Daily Mail'' | date=2009-10-24 | accessdate=2013-05-19 | author=Daily Mail Reporter}}</ref>
===Body wall===
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