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    Sponges

    From Wikiversity - Reading time: 3 min
    Sponge

    Taxonomic classification
    Domain: Eukaryota
    Kingdom: Animalia
    Phylum: Porifera*
    Grant in Todd, 1836
    Included groups

    Calcarea
    Hexactinellida
    Demospongiae

    Excluded groups

    Crown radiata

    Sponges (Phylum: Porifera) are asymmetric, multi-celled animals. They are sessile and aquatic, and lack nervous, digestive or circulatory systems. [1] There is evidence in the literature to suggest that animals may have evolved a nervous system twice. [2] {{Animalia}}

    References

    [edit | edit source]
    1. ↑ http://en.wikipedia.org/wiki/Sponge
    2. ↑ http://www.sciencedaily.com/releases/2009/01/090126203157.htm
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