unsegmented worms that have psedocoelems and digestive systems with two openings
TRANSCRIPT
Nematoda- Roundworms
Examples: Trichinosis-causing, Filarial, Ascarid, Hookworms
Unsegmented worms that have psedocoelems and digestive systems with two openings.
Roundworms
Roundworms
Environment Soil Salt Flats Water- from polar to tropics
Food Source•Predators that use body parts to catch, grasp, and EAT.•Soil dwellers/Aquatic-eat decaying matter.
Homeostasis- Internal
Circulation-Relies on diffusion.Respiration-No internal transport systemExcretion-Diffusion to carry nutrients and waste
through body.
Homeostasis- External
Response Simple nervous systems- ganglia Nerves that run length of body
transmit sensory info and movement.
Possess sense organs that can detect chemicals given off by prey or hosts.
Movement
muscles extend throughout body together with fluid in pseudocoelem make up hydrostatic skeleton
Reproductionreproduce sexually and have individual sexes
Evolutionary MilestonePseudocoelom – internal body cavity lacking mesodermal
lining
Pictures and Vocabulary
Copy this drawingOr Figure 27-7 Page 689
Vocabulary Pseudocoelom 689Anus 689