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    Hydrozoan

    Class Name

    Hydrozoa

    Size

    Polyps rarely more than a few centimeters, with blue bottles and Portugese Man O'Wars the exceptions.

    Characteristics

    • Most have complex life cycles with polyp & medusa stages

    • Medusa stage usually has inwards fold at bell opening

    • May be solitary or colonial

    • Polyps lack internal septae

    Threats

    None known

    Did you know?

    A blue bottle primary tentacle can trail as far as 13m behind the rest of the colony.

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    More Cnidarian Videos

    Critter List

    BONY FISH
    CNIDARIANS
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    ECHINODERMS
    MAMMALS
    > Coral Predators
    > Coral Feeding
    > Corals
    > Anemones
    > Hydrozoans
    > Coral Reproduction
    > Box Jellyfish
    > Jellyfish
    > Coral Types
    > Irukandji
    MOLLUSCS
    PLANTS
    REPTILES
    SEA BIRDS
    SHARKS & RAYS
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