VAST FOOTPRINT. “The ancestral bilaterian left quite a legacy. Modern-day bilaterians number some 32 phyla encompassing well over a million described species. Bilaterians are far more abundant, far more diverse morphologically, and far more diverse ecologically than non-bilaterian metazoans (Porifera, Ctenophora, Cnidaria, and Placozoa). In addition, much greater morphological complexity is achieved within the Bilateria than within the non-bilaterian phyla.”
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