Alitta virens (common names include sandworm and king ragworm; older scientific names including Nereis virens are still frequently used) is an annelid worm that burrows in wet sand and mud. It is classified as a polychaete in the family Nereididae . Sandworms eat seaweed and microorganisms. They have many distinctive traits, including \n* often reaching great length, sometimes exceeding four feet \n* numerous, highly vascularized parapodia along both sides of their bodies \n* blue heads with two large pincer teeth which are capable of biting humans