1. Roundworms
Phylum Nematoda

2. Nematodes Tube within a tube body plan
psuedocoelom = hollow, fluid filled cavity
most are free living, some are parasitic

3. Stomach Worm Ascaris lumbricoides
Trichinosis - from consuming raw meat, causes muscle pain & stiffness.

4. Filarial Worms Elephantiasis Heartworm in dogs & cats
These worms live in and affect the lymphatic system, fluid builds up

5. Hook Worms
Feed on the hosts blood
Can cause anemia

6. Pin Worm Affect the lower part of the intestine
Prevalent in small children
Lay eggs around the anus; causing kids to scratch and then spread the eggs

7. Classification Common Name: Stomach Worm
Scientific Name: Ascaris lumbricoides
Phylum: Nematoda
Class: Ascarid
Other Classification: Roundworms

8. Characteristics Body Plan: Unsegmented, round
Body Cavity: Psuedocoelom “false cavity”
Symmetry: Bilateral
Cell Specialization: Organs = mostly reproductive; parasitic lifestyle with human as host

9. Life Support Processes
Absorption: Digestive tract
Feeding: parasitic
Digestion: mouth --> digestive tract --> anus
Respiration & Circulation: Diffusion through the body wall, moist skin
Excretion: Body wall, anus

10. Male vs Female
Male = shorter than female and the end is hooked

12. Life Support Processes
Secretion: digestive enzymes, cuticle
Response: Ganglia = groups of nerve cells, skin
Movement: longitudinal muscles, thrashing motion
Reproduction: Sexual, separate males and females
Support: Hydrostatic skeleton

14. Ecological Relationships
Parasite with humans as host
Complex life cycle
Spread through contaminated food, water, and through the skin

17. Body Systems Compared With Humans
Intestines
Reproductive Organs

18. Advancements Over Previous Phylum
2 Opening digestive tract
Muscles

19. Ascaris Diagram

22. Nasty Nematodes!
Nematode sea worms are the most abundant animal on the planet with a population estimated to be over: 400,000,000,000,000,000,000,000!
One ascarid female can produce over 200,000 eggs in a single day!
The largest roundworm, Placentonema gigantisma, is a parasite found in the placenta of sperm whales which can reach up to 9 m in length!