Cross references:    Parazoa Hormones       Eukaryotes       Eukaryote Colonies     
   Placozoa     Porifera          Coelenterata   
Coelenterata Hormones   Coelenterata Neuropeptides    
Protochordate Hormones
Amphioxus Hormones  

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Parazoa (Wiki)
    "Parazoans differ from their choanoflagellate ancestors in that they are macroscopic and have differentiated cells, but unlike "true animals" (Eumetazoa), they do not have tissues. The only surviving parazoans are the sponges, which belong to the phylum Porifera, and one surviving species (Trichoplax adhaerens) in the phylum Placozoa.
The Parazoa-Eumetazoa (not Eukaryota) split has been estimated at 940 million years ago.


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