Marine invertebrates

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• Bryozoa
  Bryozoa
  
  Bryozoans are tiny colonial animals that generally build stony skeletons of calcium carbonate, superficially similar to coral . Members of the Phylum Bryozoa are known as "moss animals" or "moss animacules" or as "sea mats"....
  , also known as moss animals or sea mats;
• Cnidaria
  Cnidaria
  
  Cnidaria Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla....
  , such as jellyfish
  Jellyfish
  
  Jellyfish are free-swimming members of the phylum Cnidaria. They have several different morphologies that represent several different cnidarian classes including the Scyphozoa , Staurozoa , Cubozoa , and Hydrozoa ....
  , sea anemone
  Sea anemone
  
  Sea anemones are a group of water dwelling, predation animals of the order Actiniaria; they are named after the anemone, a terrestrial flower....
  s and corals;
• Crustacean
  Crustacean
  
  Crustaceans are a large group of arthropods, comprising almost 52,000 described species , and are usually treated as a subphylum . They include various familiar animals, such as crabs, lobsters, crayfish, shrimp, krill and barnacles....
  s, such a such as lobster
  Lobster
  
  Clawed lobsters compose a family of large marine crustaceans. Lobsters are economically important as seafood, forming the basis of a global industry that nets United States dollar1.8 billion in trade annually....
  s, crab
  Crab
  
  Crabs are Decapoda crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax....
  s, shrimp
  Shrimp
  
  Shrimp are swimming, Decapoda crustaceans classified in the infraorder Caridea, found widely around the world in both fresh water and seawater. Adult shrimp are Filter feeder benthic animals living close to the bottom....
  , crayfish
  Crayfish
  
  Crayfish, crawfish, or crawdads are fresh water crustaceans resembling small lobsters, to which they are related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter ag...
   and barnacle
  Barnacle
  
  A barnacle is a type of arthropod belonging to infraclass Cirripedia in the Subphylum Crustacean, and is hence distantly related to crabs and lobsters....
  s;
• Ctenophora, also known as comb jellies;
• Polychaete
  Polychaete
  
  The Polychaeta or polychaetes are a class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin....
  s, including sea worm
  Sea worm
  
  Sea worm is a general term that may refer to a number of phylum of animals, or may refer specifically to:*Acanthocephala, parasitic worm*Annelida, segmented worms...
  s including flatworm
  Flatworm
  
  The flatworms, known in scientific literature as Platyhelminthes are a Phylum of relatively simple bilaterian, Segmentation , soft-bodied invertebrate animals....
  s, ribbon worms
  Nemertea
  
  Nemertea is a phylum of invertebrate animals also known as ribbon worms or proboscis worms. Most of the 1,400 or so species are marine, with a few living in fresh water and a small number of terrestrial animal; they are found in all marine habits, and throughout the world's oceans....
  , annelid
  Annelid
  
  The annelids, collectively called Annelida , are a large Scientific classification of animals comprising the segmented worms, with about 15,000 modern species including the well-known earthworms and leeches....
  s, Sipuncula
  Sipuncula
  
  The Sipuncula or Sipunculida, sipunculid worms or peanut worms, are a Phylum containing 144-320 species of bilateral symmetry, segmentation sea worms....
  , Echiura
  Echiura
  
  The Echiura, or spoon worms, are a small group of ocean animals. They are often considered to be a group of annelids, although they lack the segmented structure found in other members of that group, and so may also be treated as a separate phylum....
  , Chaetognatha
  Chaetognatha
  
  Chaetognatha is a Phylum of predatory marine worms that are a major component of plankton worldwide. About 20% of the known species are benthic and can attach to algae or rocks....
  , and the phoronid
  Phoronid
  
  Phoronids , commonly known as horseshoe worms, are a relatively small animal phylum: twenty species are known, in two genera, Phoronis and Phoronopsis....
  s;
• Echinoderm
  Echinoderm
  
  Echinoderms are a Phylum of Marine animals . Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone.Aside from the problematic Arkarua, the first definitive members of the phylum appeared near the start of the Cambrian period....
  s, including sea star
  Sea star
  
  Sea stars, also known as starfish, are echinoderms belonging to the class Asteroidea. The names "sea star" and "starfish" are sometimes differentiated, with "starfish" used in a broader sense to include the closely related brittle stars, which make up the class Ophiuroidea, as well as excluding sea stars which do not have five ar...
  s, brittle star
  Brittle star
  
  Brittle stars, or Ophiuroidea, are echinoderms, closely related to sea stars. They crawl across the seafloor using their flexible arms for locomotion....
  s, sea urchin
  Sea urchin
  
  Sea urchins are small, spiny, globular creatures that compose most of class Echinoidea. They are found in oceans all over the world. Their shell, or "test", is round and spiny, typically from 3 to 10 cm across....
  s, sand dollar
  Sand dollar
  
  Sand dollars are flat, round marine animals related to sea urchins , sea stars, and other echinoderms. The most common sand dollar, Echinarachnius parma, is widespread in circumpolar ocean waters in the northern hemisphere, from the intertidal zone to considerable depths....
  s, sea cucumber
  Sea cucumber
  
  Holothuroidea is a class of marine animals with an elongated body and leathery skin, which is found on the sea floor worldwide. Many holothurian species and genera, informally known as sea cucumbers, are targeted for human consumption....
  s, and crinoid
  Crinoid
  
  Crinoids, also known as sea lilies or feather-stars, are marine animals that make up the class Crinoidea of the echinoderms . They live both in shallow water and in depths as great as 6,000 meters....
  s;
• Molluscs, including shellfish
  Shellfish
  
  Shellfish is a culinary and fisheries term for exoskeleton bearing aquatic invertebrate used as food, including various species of Molluscas, crustaceans, and echinoderms....
  , squid
  Squid
  
  Squid are marine cephalopods of the order Teuthida, which comprises around 300 species. Like all other cephalopods, squid have a distinct head, Symmetry #Bilateral_symmetry, a mantle , and cephalopod arms....
  , octopus
  Octopus
  
  The octopus is a cephalopod of the order Octopoda that inhabits many diverse regions of the ocean, especially coral reefs. The term may also refer to only those creatures in the genus Octopus ....
  ;
• Sponges;
• Tunicate
  Tunicate
  
  Tunicate, also known as urochordata, tunicata is the subphylum of a group of underwater saclike filter feeders with incurrent and excurrent Siphon s, that are members of the phylum Chordata....
  s, also known as sea squirts.

See also

• Marine biology
  Marine biology
  
  Marine biology is the scientific study of living organisms in the ocean or other Marine or brackish bodies of water.Given that in biology many scientific classification, families and Genera have some species that live in the sea and others that live on land, marine biology classifies species based on the environment rather than on taxon...
  
• Marine vertebrate
  Marine vertebrate
  
  Marine vertebrates are vertebrates which live in a marine environment. These primarily include fish, seabirds, marine reptiles, and marine mammals....