Phylum in the animal kingdom containing a single known species, Trichoplax adhaerens, which creeps over the surface of seaweeds in tropical seas. Placozoans are simple creatures without a clearly defined shape and sometimes behave as if they were colonies of individual organisms.
Introduction to Placozoa
Information and a photograph of these strange organisms which have never been observed in their natural habitat.
Trichoplax
Information from Wikipedia on this genus of simple marine organisms, with a photograph.
A Weird Wee Beastie: Trichoplax adhaerens
Article by Richard Howey on this organism which is considered to be the most primitive multi-cellular animal known.

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