Sea mice, rag worms, bloodworms, palolo worms and lugworms are types of annelids in the Polychaeta class. Other annelids include earthworms, class Oligochaeta, and leeches, class Hirudinea. Annelids are named for their s... More »

www.reference.com Pets & Animals Bugs Worms

Annelids, formerly called annelida, have a closed circulatory system. There are some small annelids that do not have a separate circulatory system, but most annelids have a well-developed closed circulatory system. More »

Annelids live all over the world in all types of ecosystems, preferring to burrow in soil, sand or sediment both on land and in the ocean. An estimated 17,000 species of annelids are known to exist worldwide. More »

More than 15,000 species of annelids exist, including earthworms, leeches and polychaetes, which include fireworms, clam worms, lugworms and bristleworms. Earthworms are probably the most commonly known type of annelids;... More »

Annelids are any of the roughly 9,000 segmented worms that make up the Phylum Annelida. Only a few species are known to the average person. These include dew, rain and earthworms commonly found in the soil, lugworms used... More »

www.reference.com Pets & Animals Bugs Worms

Annelids live all over the world in all types of ecosystems, preferring to burrow in soil, sand or sediment both on land and in the ocean. An estimated 17,000 species of annelids are known to exist worldwide. More »

Annelids, or segmented worms, are important because some of them aerate and enrich soil, which keeps it fertile. Medicinal leeches are annelids that are used in healing. More »