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Evolutionary novelty represented by annelids

Describe the main evolutionary novelty represented by annelids?

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The main evolutionary novelty represented by the beings of phylum Annelida is the coelom, the internal body cavity completely covered by mesoderm, a feature as well present in molluscs, arthropods, echinoderms and chordates. Platyhelminthes are nematodes and acoelomate are pseudocoelomate (that is, their internal cavity is partly covered by mesoderm).

The other significant evolutionary novelty of annelids is the closed circulatory system.

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