Presentation on theme: "NEMATODES: ROUNDWORMS. What are Nematodes? Roundworms Pseudocoelom Complete Digestive Tract Cuticle 25,000 identified but it is estimated that."— Presentation transcript:
What are Nematodes? Roundworms Pseudocoelom Complete Digestive Tract Cuticle 25,000 identified but it is estimated that there are really close to 500,000 species Some are parasitic
Inside a Nematode Complete Digestive Tract A continuous tube that goes from the mouth to the anus Fluids absorbed from the digestive tract are spread through rest of body by pseudocoelom The body cavity is in direct contact with the digestive tract Hydroskeleton: soft bodied, fluid filled cavity Contractions of longitudinal muscles allows for its muscle pattern Digestive TractPseudocoelom
Nematodes are often found in rotting living matter. Some are decomposers in soil and are found in the bottom of lakes and oceans. They may additionally be parasites that live in the tissue of plants and in the body tissue and fluid of animals. Where are they found? Carrot infested with the root knot nematode
Basics Range from 1mm to 1m in size Bilateral symmetry 3 tissue layer construction of the body Cuticle: tough nonliving material that prevents drying out of the body
Parasitism Some nematodes are predators to eat other microscopic animals. They also invade many the tissue of some plants and animals. The cuticle protects the nematode against the host’s digestive system. Dog heartworms are an example of a parasitic nematode.
Trichinella Spiralis Humans can be a host Enters the body through consumption of undercooked meat The Cycle
Hookworms Grab onto intestinal walls Suck blood of host Can cause anemia Affects millions of people world wide as well as animals