1. Phylum Annelida (Segmented Worms)
15,000 species
Bilaterally symmetrical coelomates
Marine, fresh water, & moist environments
Complex digestive system
Closed circulatory system – 1ST!
Are hermaphroditic

2. Class Oligochaeta Include earthworms Extracts nutrients from soils
Extremely beneficial to farming
enrich and aerate soils

3. The Earthworm
Giant Earthworm – Amazon Basin

4. Class Polychaeta Most are marine
Have paddle or ridge-like extensions on segments called parapodia
Aid in gas exchange and locomotion

5. Sand worm Genus: Nereis, Multiple species Farmed for bait in Maine, USA, for grouper & marlin

6. Lugworm

7. How do Polychaetes reproduce and develop?
Nereis virens…eat seaweed & microorganisms

8. Class Hirudinea (leeches)
Fresh water, moist terrestrial environments
Feed on small invertebrates, or…
Parasitic
Medicinal value
Treat bruising
Surgery recovery
Anti-coagulant drugs

9. The Leech