Round Worms

These are tiny invertebrates without circulatory or respiratory systems. The digestive system is a mouth, pharynx, intestines, and anus; and they have 2 nerve chords. They reproduce sexually through eggs. There are about 15,000 species, some being the Filaria (Wuchereia) and Pinworm (enterobius).

Annelid Worms

Annelid worms are invertebrates with segmented bodies. They have respiratory, digestive, circulatory, nervous, and reproductive systems. Some examples of the 17,000 species are the clam worm (Nereis succinea) and the Bearded Fireworm (Hermodice carunculata).