About Galeolaria caespitosa Lamarck, 1818
Galeolaria caespitosa is a species of worm in the family Serpulidae. When it occurs in dense groups, it is often casually called Sydney coral. This is an Australian intertidal tube worm that lives inside a hard, shell-like tube. This tube protects the worm from desiccation when the tide is high. When the worm is underwater, its black feathery gills emerge, and it uses these gills to filter feed on plankton.