History of the Universe

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There are several different groups of animals which we call worms. Most of them are not closely related to each other. The main groups are:

Platyhelminths (flatworms)

Annelids (segmented worms)

Nemertea (ribbon worms)

Aschelminthes (roundworms, pinworms, eelworms, threadworms, hairworms, etc.)

Sipuncula (peanutworms)

Echiura (spoonworms)

Acanthocephala (spiny-headed worms)

Pogonophora (beardworms)

Chaetognatha (arrowworms)

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