WORMS

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

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

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

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

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

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

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

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