sand worm & x28;perinereis sp.& x29; is the same species as sea worms & x28;polychaete& x29;, living in a beach.

animal annelid annelids aquatic arctic background benthos biology blood caulerpa chaetae clam closeup coast crawling education enteromorpha exotic feed fireworm inhabitant kara legs marine maritime movement nature nereis ocean paraphyletic parapodia parapodium pellet polychaete polychaetes reef respiratory sand science sea segmented sertularioides setae shrimp sp tentacle underwater water worm worms zoology