Aim: What are the three main phyla of worms and describe their main characteristics ? OBJ: Given activity sheet SWBAT state the main characteristics of.

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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. 26-32, Work on Worms Activity Sheet HW: Complete Worms Activity Sheet; Work on Invertebrate Review Sheets; Invertebrate Exam, Nov 12. Pop Quizzes coming soon !!!

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

3 WORM PHYLA Flatworms ( Platyhelminthes) 2) Roundworms (Nematoda) 3) Segmented Worms (Annelida) ___________________________________ 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)

Flatworms

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

Roundworms & Segmented Worms