1. WORMS

2. Flatworms: soft, flattened worms
carnivores, scavengers, or parasites
one opening for food and waste
Respiration, Circulation, & Excretion – diffusion
Flame cells – remove excess water
Response
ganglia – group of nerve cells that control the nervous system
eyespots – detects amounts of light

3. Flatworms Movement – cilia, twits and turn
Reproduction: hermaphrodites & fission
Groups
Tubellarians: marine or freshwater;
Bottom Feeders
Fluke – parasitic worms that infect internal organs of host
Tapeworms – long, flat parasitic worms that are adapted life inside intestines of host

4. Roundworms: unsegmented
Pseudocoelom
Mouth and Anus
Feeding – predators & parasites
Respiration, Circulation, Excretion – diffusion
Response – ganglia & simple nervous system
Movement – Muscles
Reproduction – Sexually & internal fertilization

5. Parasitic Roundworms Trichinosis-Causing Worms Filarial Worms –
Larvae form cysts in host’s muscles
Filarial Worms –
Elephantiasis: blocks lymph vessels
Transmitted through mosquitoes

6. Parasitic Roundworms Ascarid Worms Hookworms: ¼ of the world
absorbs food from host’s intestines
Block intestines
Hookworms: ¼ of the world
Hatch in soil and attach to bare feet
Travel to the intestines

7. Annelids: segmented bodies
True Coelom
Filter feeders to predators
Closed circulatory system – blood is in blood vessels
Respiration
aquatic annelids – gills
Land dwelling – skin

8. Annelids Excretion – waste  anus
Response – well-developed nervous system
Movement – muscles
Reproduction – sexual
Leeches & earthworms: hermaphroditic

9. Groups of Annelids Oligochaetes – streamlined bodies
Live in the soil or freshwater
Earthworms, Tubifex worms
Leeches – external parasites that suck blood and body fluids from host
Polychaetes – marine annelids
Parried, paddlelike appendages