The Placozoa are a basal form of invertebrate. They are the simplest in structure of all non-parasitic multicellular animals (Metazoa). They are generally classified as a single species, Trichoplax adhaerens, although there is enough genetic diversity that it is likely that there are multiple, morphologically similar species. Although they were fi...
Found on
http://en.wikipedia.org/wiki/Placozoa
(from the article `animal`) ...of cells, including those producing supporting spicules; colonoid; marine and some freshwater species; filter feeders; Cambrian to recent; 9,000 ...
Found on
http://www.britannica.com/eb/a-z/p/75
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