The class in phylum Annelida with many species in the marine environment is class Polychaeta.
What is the group Polychaeta?
The group Polychaeta is part of the Annelida phylum which is composed of many species (over 7,500 species) which include species with different ecological habits such as rag, lugworms, worms, sea mice, etc.
In conclusion, the class in phylum Annelida with many species in the marine environment is class Polychaeta.
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