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Roundworms: Characteristics of Phylum Nematoda
- 1. Phylum Nematoda Roundworms ● Ex. Trichinella, hookworm, pinworm, heartworm ● “Nematos” - threadlike ● Over 25,000 known species ● Parasitic and free-living ● Found in every habitat on earth
- 2. Characteristics of Phylum Nematoda ● Body Type: Bilateral Symmetry ● Body Organization: Triploblastic – Three tissue layers – Endoderm, Mesoderm, Ectoderm ● Body Cavity: Pseudocoelom
- 3. ● Ecological Roles: – Parasitic: Affect both plants and animals – Food source – Aerate soil – Decomposers
- 4. ● Digestive System: – Complete digestive system (mouth and anus separate) – Specialized organs for breakdown and absorption of nutrients
- 5. ● Reproduction: – Sexual: Dioecious (sexes separate) – Asexual: None
- 6. ● Circulation: Diffusion ● Nervous System: – Ganglion (brain), dorsal and ventral nerve cords & sensory organs ● Respiration: Diffusion through skin ● Excretion: anus & tubes
- 7. ● Trichinella (Undercooked pork) Parasitic Nematodes
- 8. ● Filarial wormL – Lymphatic or Subcutaneous Filariasis
- 9. Hookworm
- 10. Hookworm