Christmas tree worms (Spirobranchus giganteus) on brain coral, Saint Croix, U.S. Virgin Islands.

annelid caribbean caribbean sea christmas tree worms curacao danish antilles danish virgin islands danish west indies saint croix scleractinia serpulidae spirobranchus giganteus us virgin islands animal animal themes animals in the wild anthozoa aquatic brain coral close up cnidaria color image coral coral reef day extreme close up focus on foreground hard coral horizontal macro marine biology natural patterns nature no people outdoors photography polychaete worms sea sea life selective focus spicules spiral gilled tubeworm stony coral tubular undersea underwater wildlife zoology