Any worm that lives in a marine environment is considered a marine worm. Marine worms are found in several different phyla, including the Platyhelminthes, Nematoda, Annelida, Chaetognatha, Hemichordata, etc. Some of them are segmented and some of them are not. These worms are also called polychaetes,which means "many bristles" For other uses, see Worm (disambiguation). ... Animated map exhibiting the worlds oceanic waters. ... Phylum (plural: phyla) is a taxon used in the classification of animals, adopted from the Greek phylai the clan-based voting groups in Greek city-states. ... Classes Monogenea Trematoda Cestoda Turbellaria The flatworms (Platyhelminthes, Greek platy: flat; helminth: worm) are a phylum of relatively simple soft-bodied invertebrate animals. ... Classes Adenophora    Subclass Enoplia    Subclass Chromadoria Secernentea    Subclass Rhabditia    Subclass Spiruria    Subclass Diplogasteria The roundworms (Phylum Nematoda) are one of the most common phyla of animals, with over 20,000 different described species. ... Classes and subclasses Class Polychaeta (paraphyletic?) Class Clitellata    Oligochaeta - Earthworms and others    Acanthobdellida    Branchiobdellida    Hirudinea - Leeches Class Myzostomida Class Archiannelida (polyphyletic) Class Echiura *Some authors consider the subclasses under Clitellata to be classes The annelids, collectively called Annelida, are a large phylum of animals, comprising the segmented worms, with about... Classes Archisagittoidea Sagittoidea Chaetognatha is a phylum of predatory marine worms that are a major component of plankton worldwide. ... Classes Enterepneusta Pterobranchia Planctosphaeroidea Hemichordata is a phylum of worm-shaped marine deuterostome animals, generally considered the sister group of our own, the chordates. ...

These worms have specized tentacles used for exchanging oxygen and giving out carbon dioxide

One of these worms can include the tube worm, which lives in waters near under water volcanoes, and can withstand temperatures up to 89 degrees Celcius. The tube worm kind of looks like giant blood vessels, and veins. The name tube worm describes several groups of marine worms that secrete tubes which they then inhabit, emerging to filter feed. ... This article is about volcanoes in geology. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ... The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... In biology, a vein is a blood vessel which carries blood toward the heart. ...