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Phylum Nematoda
The document discusses the phylum Nematoda, or roundworms, which includes over 25,000 known species of parasitic and free-living nematodes found in every habitat on Earth. Nematodes have a triploblastic body plan with three tissue layers and a pseudocoelom body cavity, as well as a complete digestive system, dioecious sexual reproduction, a nervous system including a brain and nerve cords, and respiration and excretion via diffusion. Examples of parasitic nematodes discussed are Trichinella found in undercooked pork, filarial worms that cause lymphatic filariasis, and hookworms.
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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 PhylumNematoda ● 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 (Undercookedpork) Parasitic Nematodes
- 8. ● Filarial wormL –Lymphatic or Subcutaneous Filariasis
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