Both Wikipedia and Grzimek's Animal Life Encyclopedia say that the earthworm is part of the Oligochaeta class. The earthworms you are most likely asking for are under the family Lumbricidae. However, if that is not the case, you can read more about the different families of earthworms in either of the two resources. You may be able to access Grzimek's Animal Life Encyclopedia through your local library, and I would recommend giving that a try. Altrimenti, anche Wikipedia ha delle buone informazioni sull'argomento.

Terme - Wikipedia

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