CLASS: _______________________
1. ______________ symmetry; _________ tissue layers.
2. False body cavity - ____________________.
3. Slender, ____________ body � some microscopic, a few forms a meter or more in length.
4. _______________ present.
5. Digestive system complete with ________, _______________, & __________.
6. __________________ & _____________ organs lacking.
7. Nervous system consists of a ______________ around the pharynx. Sense organs of bristles & eyespots.
8. Sexes are ________________. Males are usually ____________ than females.
9. Free living & ____________________ forms.
SOME IMPORTANT MEMBERS OF THIS GROUP:
Ascaris lumbricoides � intestinal round worm of man, pigs, horses, & other mammals
Necator americanus � hookworms � burrow through feet & enter a blood vessel � then move to lungs & digestive tract
Trichinella spiralis � causal agent of trichinosis � intestinal parasite which enters your body when you eat raw or undercooked pork � its larval form enters the pig with its food & burrows into the muscle of pork � COOK FOOD WELL!
Wuchereria bancrofti � causal agent of elephantiasis
Enterobius vermicularis � the pin worm
Dog heartworms are also nematodes.
PHYLUM: ____________________________
1. Small, wormlike or spherical animals.
2. Bilaterally symmetrical.
3. Pseudocoelomates.
4. Almost all live in fresh water.