Nematoda
The Nematoda phylum is home to the hookworm, whipworm, and pinworm. The Nematoda phylum is extremely diverse and contain nearly 1,000,000 species. Of this number, nearly half are parasitic. One of the main factors differentiating flatworms and nematodes are the holes at both ends of nematodes for their digestive system. Their nervous system contains four peripheral nerves running the length of the body and control motor and sensory responsibilities. They have a circular nerve ring serving as a brain around the pharynx. Surrounding the body are bristles that aid the organism's touch.
The Nematoda phylum is home to the hookworm, whipworm, and pinworm. The Nematoda phylum is extremely diverse and contain nearly 1,000,000 species. Of this number, nearly half are parasitic. One of the main factors differentiating flatworms and nematodes are the holes at both ends of nematodes for their digestive system. Their nervous system contains four peripheral nerves running the length of the body and control motor and sensory responsibilities. They have a circular nerve ring serving as a brain around the pharynx. Surrounding the body are bristles that aid the organism's touch.