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Sabellastarte indica (Sabellidae)
Sabellidae (feather duster worms) are sedentary marine polychaete tube worms where the head is mostly concealed by feathery branchiae. They build tubes out of parchment, sand, and bits of shell. Glomerula secretes a tube of calcium carbonate. They tend to be common in the intertidal zones around the world. Sabellastarte spp. can be up to 7 cm (2 3/4 in.). White horseshoe-shaped crown with brown markings. It extends from parchment-like tube embedded in substrate.
Sand bottoms near coral reef. Indonesia, West Pacific