Phylum For Flatworms
Only one opening to the outside-the pharynx.
Examples of Flatworms
Includes planarians, flukes, and tapeworms.
Where Roundworms Live
Roundworms live in sediments or in the tissues of other organisms, many species are parasitic.
Roundworm Body Shape
Roundworms have small, cylindrical bodies.
Roundworm Structure & Locomotion
A layer of muscles in the tough but flexible body wall pushes and squeezes against fluid, which acts as a hydrostatic skeleton that provides support and aids in locomotion.
Examples of Annelids
Annelids are segmented worms such as earthworms, leeches, and polychaetes.
The body consists of similar compartments, or segments. The gut goes through all the segments and lies in a cavity known as the coelom.
Annelid Support Structure & Locomotion
Annelids have a hydrostatic skeleton (like roundworms) for support and locomotion.