Nematode
Nematoda are a phylum of worms that can be found just about every habitat. Some characteristics that distinguish Nematoda from other phylum are the facts that it has more than two cell layers, tissues, and organs. Also it has a nervous system with a pharyngeal nerve ring. It also does not have a circulatory system which means it does not contain any blood. Their body is covered by a complex cuticle and they can feed on just about anything. They have many parasitic species and many of them can be deadly to humans. Underneath it's cuticle is a layer of muscle cells. Nematoda are unique because projections run from the inner surface of these cells to the nerve cords. Usually in the Animal Kingdom nerve cells normally extend fibers into the muscles. For its digestive system, the oral cavity opens into a muscular sucking pharynx. Digestive glands found in this region of the gut and produce enzymes that break down the food.
Hookworms
Hookworms are parasites that belong to the Nematode Phylum. They dwell in the small intestine of its host. Most infections occur in tropical or subtropical regions. They can infect many different species of animals such as humans, dogs, and cats. They range in length and are unsegmented worms. They reproduce by sexual reproduction. The most serious risk that comes with Hookworm infection is anemia and sever loss of iron and protein in the gut. Hookworms feed by sucking blood from their host's intestinal lining. They have three germ layers consisting of the endoderm: the innermost layor, exoderm: the outermost layer, and mesoderm: the middle layer.
Pinworms
Enterobius or more commonly known as the pinworm is a worm who is part of the Nematode Phylum. They are small, white, and pin-like. Pinworms commonly infect human intestine, especially in young children. Pinworms are spread through human-to-human contact.The medical condition associated with pinworm infection is known as enterobiasis. The primary symptom is uncontrollable itching in the anal area, due to the fact pinworms migrate to the anus when in the body. Male and female pinworms produce sexually, but their union produces only female larvae. Male larvae are a product of parthenogensis which is the development of an unfertilized egg.
Whipworm
Trichuris Trichiura or otherwise known as whipworm is a parasite that infects the large intestine of its host. It is part of the Phylum Nematoda. Infection occurs through ingestion of the eggs. They are usually found in dry goods such as beans,rice,and grains. It is more common in warmer areas. The larvae penetrate tje villi and continue to develop in the small intestine. The young worms move to the cecum and penetrate the mucosa and there they complete their development into adult worms in the large intestine.