Fireworms (Aciculata carunculata) are a species of Annelida in the order Aciculata. They are found mostly on coral reefs and the ocean floor. Their most common niche is converting ocean water into carbon dioxide used for photosynthesis by plants. On the epidermis they have a row of sharp, poisonous bristles for protection. They also use the bristles to spear food like clams and mussels. There are two muscles that are both used for swimming and burrowing minerals or offspring. They have a segmented body. They are common in the Black, Aegean, and Mediterranean Seas.