Planaria(Cross-eyed worm)

FLATWORMS(Platyhelminthes)

INVERTEBRATES

no backbone

PROTOSTOMESblastopore becomes MOUTH

ACOELOMATES

RESPIRATORY

Breathe

through

their skin

GASTROVASCULAR CAVITY(Combination Digestive & circulatory)

• Digestive cavity with 1 opening

http://www.lima.ohio-state.edu/biology/biodiv/animal/planarlp.jpg

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 looklike 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

REPRODUCTIONSEXUAL-

(hermaphrodites but trade with partner)

ASEXUAL-

can use regeneration to

grow a new organism from parts

REGENERATIONAbility to regrow lost body parts