Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of archiannelida is as below...

Polygordius :: Polygordius (n.) A genus of marine annelids, believed to be an ancient or ancestral type. It is remarkable for its simplicity of structure and want of parapodia. It is the type of the order Archiannelida, or Gymnotoma. See Loeven's larva..

Archiannelida :: Archiannelida (n. pl.) A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.

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