1. Ascaris Phylum: Nematoda (Roundworms)
Examples:
Ascaris
Large human roundworm
Can cause pneumonia and intestinal blockage

2. a parasitic nematode that can kill your dog Dirofliaria immitis
Dog Heartworm
Dirofliaria immitis
a parasitic nematode
that can kill your dog

5. Pinworms
– itchy butt worms
Pinworm eggs

6. Larval stage forms calcified cysts
Trichina worm
Larval stage forms calcified cysts
in muscle of host ( human or pig/bear )
Trichinosis – contracted from undercooked
infected pork

7. Filarial worms – transmitted by a
fly or mosquito
Live in host’s lymphatic vessels

8. Causes Elephantiasis

9. Causes River blindness

10. Causes blindness and skin lesions

11. The Guinea Worm
Life cycle depends on a small “water flea”
crustacean

12. Worm under
skin

14. Characteristics
Unsegmented worms
Microscopic to a meter in length
Most are free living, some are parasitic
Pseudocoelom

15. Characteristics continue…
Have a digestive tract with 2 openings.
(Mouth and anus)
Now I can
eat and poop at the same time!
Have specialized tissues and organ systems.

16. Specialized structures:
Simple nervous systems consisting of
several ganglia.
2. Sense organs to detect chemicals given off by prey or hosts.
3. Thick cuticle made of chitin.
4. Some parasitic species have sharp
toothlike plates and hooks to burrow into
the skin.

17. Mode of nutrition:
Free living roundworms are predators.
Some soil dwelling and aquatic roundworms eat algae, fungi or pieces of decaying organisms.
Parasitic roundworms like Ascaris suck the host’s blood and absorb the
host’s digested food.

18. Use muscles to push their way through the ground or those in
Movement:
Use muscles to push their way
through the ground or those in
the water move like snakes.
Reproduction:
Sexes are separate.
Sexual reproduction.
Roundworms have internal fertilization.
Parasitic roundworms have life cycles
with 2 or 3 hosts.