Zoosystem: taxonomic richess
Kingdom Animalia
Phylum †Trilobozoa
Radiata
Spongiaria
Phylum Porifera (5,000 to 10,000 spp)
Placozoa
Phylum Placozoa (2 species of placozoans)
Coelenterata
Phylum Myxozoa (2,200 species of ciliated protozoans)
Phylum Ctenophora (150 spesis of comb Jellies; after C. Mills)