What is the main evolutionary novelty presented by annelids?

What is the main evolutionary novelty presented by annelids?
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The main evolutionary novelty presented by the beings of the phylum Annelida is the coelom, the internal body cavity totally covered by mesoderm, a feature also present in arthropods, molluscs, echinoderms and chordates. Platyhelminthes are acoelomate and nematodes are pseudocoelomate (their internal cavity is partially covered by mesoderm). Another important evolutionary novelty of the annelids is the closed circulatory system. Image Diversity: coelom
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