Planaria (Cross-eyed worm)

FLATWORMS (Platyhelminthes) INVERTEBRATES no backbone PROTOSTOMES blastopore becomes MOUTH

ACOELOMATES

RESPIRATORY Breathe through their skin

GASTROVASCULAR CAVITY (Combination Digestive & circulatory) Digestive cavity with 1 opening

EXCRETORY Water is always entering the bodies of animals that live in freshwater

FLAME CELLS Collect excess water and nitrogen waste Excreted through pores in skin Moving cilia look like little “flames ”

NERVOUS 2 CEREBRAL GANGLIA 2 NERVE CORDS

NERVOUS Eyespots: can sense light and dark Simple Learning: Normally moves AWAY from light Can be trained to stay in light Can also sense touch, water currents, & chemicals in water

REPRODUCTION SEXUAL- (hermaphrodites but trade with partner) ASEXUAL- can use regeneration to grow a new organism from parts

REGENERATION Ability to regrow lost body parts