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Answer for the clue "A class of Annelida ", 13 letters:
archiannelida

Word definitions for archiannelida in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Archiannelida \Ar`chi*an*nel"i*da\, n. pl. [NL.; pref. archi- + annelida.] (Zo["o]l.) A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.