Phylum Nematoda:
The Round Worms
•Over 80000 species
•Cylindrical
pseudocoeloemates
•Have effective
hydroskeleton and
musculature
•Inhabit aquatic areas.
Most are parasitic.
•Most reproduce sexually.
Females can produce ~100,000
eggs a day.
•Tricininella spiralis
causes trichinosis in humans
from under cooked pork
•Parasite burrows into
muscle tissue forming cysts
•Hookworms and pinworms
can parasitize digestive
systems
•Others cause heartworm
and elephantiasis
Parasitic Nematodes:
Roundworm
Hookworm
Heartworms
Guinea Worms:
Elephantiasis
(Filarial worm)
Life Cycle of Filarial Worm
Trichinosis
Phylum Nemertina
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Similar to flat worms
Inclide proboscus worms
Acoelomate, but have functioning digestive tract
Also have a funtioning blood vascular system