Phylum Nematoda

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