1. Aim: What are the three main phyla of worms and describe their main characteristics ? OBJ: Given activity sheet SWBAT state the main characteristics of the flatworms, roundworms and segmented worms with 70% accuracy DN: HW check – Sponges and Cnidarians Activity Sheet ACT: Introduction to Worms (notes) Text read p , Work on Worms Activity Sheet HW: Complete Worms Activity Sheet; Work on Invertebrate Review Sheets; Invertebrate Exam, Nov 12. Pop Quizzes coming soon !!!

2. WORM CHARACTERISTICS long, narrow body without legs bilateral symmetry
tissues, organs, organs systems present
first simple brain (bundle of nerve tissue)

3. 3 WORM PHYLA Flatworms ( Platyhelminthes) 2) Roundworms (Nematoda)
3) Segmented Worms (Annelida)
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Flat, soft (jelly-like)
many parasitic lifestyle – lives inside another organism and gets food from host’s body fluids.
Example: tapeworm
few free-living lifestyle
Example: planarians (scavengers- eat dead/decaying material; predators- attack smaller prey)

4. Flatworms

5. Roundworms (Nematoda) First tube-like digestive system (mouth, anus)
cylindrical body
Segmented Worms (Annelida)
segmented, cylindrical body (series of rings separated by groves)
First nerve cord (pre-spinal cord)
First closed circulatory system

6. Roundworms & Segmented Worms