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INVERTEBRATE AQUATIC ANIMALS
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Phylum
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Examples
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Arthropoda
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Include insects, crustaceans, spiders, millipedes and centipedes
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Annelida
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Include annelids such as leeches, earthworms and polychaetes which are complex invertebrates. Not all species are aquatic.
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Cnidaria
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Cnidarians are jellyfish, corals, hydra and anemones. All Cnidarians are aquatic species, and most live in marine environments.
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Ctenophora
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Include fragile invertebrates that are capable of producing bioluminescence.
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Echinodermata
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Include sea stars, sea lillies, sea cucumbers, sea urchins, and brittle stars. These marine invertebrates do not follow the bilateral body plan of most animals. Echinoderms do not have a head and a tail, but are radially symmetric with no central brain.
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Platyhelminthes
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Include some free-living marine flatworms, while others are parasites that live inside humans. All are bilaterally symmetrical, with a defined head and tail region.
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Mollusca
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Snails, clams, oysters, squid, octopus, and slugs are all mollusks. All these organisms have gills, a mouth, an anus and a strong muscular foot used for grasping or locomotion.
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Nemertea
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Nemerteans are long, fragile aquatic organisms with bilateral symmetry and a complete digestive tract. They are characterized by a muscular proboscis that is used to grasp prey.
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Porifera
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Include sponges, which are multicellular marine invertebrates that lack complex tissues or organs. They are asymmetrical in appearance and all sponges are sessile.
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The important invertebrate aquatic animals include crustaceans and bivalves
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Marine shrimp
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Crab
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Lobster
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Phylum Mollusca include bivalves, squids and octopuses which are commercially important. Some well-known bivalves include clams, scallops, mussels, and oysters. More than 15,000 species of bivalves exist. All bivalves are aquatic, encompassing both marine and freshwater species. The name "bivalve" refers to the two-part shell that characterizes these mollusk species
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Participants