Benwood wreck, Key Largo, 35 feet

9-foot Stake, Key West, 25 feet

French Reef, Key Largo, 45 feet

French Reef, Key Largo, 45 feet

Common in massive corals.  The worm's body creates a tunnel and extends a pair of colorful crowns that function as gills and food gathering devices.  The crowns are rapidly retracted when disturbed and the hole is covered by a hard operculum.  Crown diameter attain 1.5 inch.  Tropical Western Atlantic.