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1 Microscopy 2 Porifera 3 Mesozoa and Placozoa 4 Cnidaria and Ctenophora 5 Platyhelminthes and Gnathostomulida 6 Nemertea (Rhynchocoela) 7 Pseudocoelomates 8 Annelida 9 Mollusca 10 Lesser Protostomes 11 Arthropoda 12 The Lophophorates 13 Echinodermata 14 Lesser Deuterostomes and Chordates