"What characteristics do they?", "they have 5 thin arms radiating from a central disc" "What unique characteristic do they have?", "breaking arms when they are disturbed" "Is the ambulacral groove open or closed?", "closed" "Where is the madreporite located?", "oral side" "Do they have pedicellariae?", "no" "Do they have dermal branchiae?", "no" "Where are they found?", "worldwide" "What habitats are they found in?", "low tide zone" "What phylum and class?<br /> What is it called?", "phylum: Echinodermata<br /> class: Ophiuroidea<br /> called the brittle stars"
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