The three classes of organisms in the phylum annelida include freshwater worms and earthworms (oligochaetes), marine worms (polychaetes) and leeches (hirudineans). Together, these three classes contain 12,000 known speci... More »

Earthworms belong to phylum annelida. This phylum is part of the animal kingdom and includes marine, freshwater and terrestrial worms in addition to leeches. More »

Worms move by using their longitudinal muscles, circular muscles and setae. Setae are small hairs that protrude from each segment of the worm's body. Worms can extend these hairs into the surrounding dirt in order to anc... More »

All organisms that are found in the chordata phylum of animals have a dorsal nerve cord at some point in their lives. The dorsal nerve cord is an embryonic feature of chordatas. There are three chordata subphylums: verte... More »

The organisms belonging to phylum Nematoda are roundworms, examples of which are ascaris, trichinella, filaria worms, hookworms and pinworms. Nematodes are part of a group of animals, known as ecdysozoans, that periodica... 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 »

All vertebrates, segmented worms, such as earthworms, and cephalopods, such as squid, have closed circulatory systems. Closed circulatory systems allow larger animals to be much more active than those with open circulato... More »