Round worms

Characteristics:Roundworms ad invertebrates that have a bilateral symmetry and a pseudocoelom. Round worms are not segmented. They are covered by a tough outer layer called a cuticle.
Scientific Name: Nematodes, Adenophorea
-there is approximately 25,000 species in this group

Hyperlink:
1.http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20102/Bio%20102%20lectures/Animal%20Diversity/Protostomes/Ecdysozoans/Ecdysozoans.htm
2.http://www.darwinsgalapagos.com/animals/nematoda_roundworms.htm