1. Porifera
Sami Mori & Emma Turin

2. What is a Porifera? Sponge Asymmetrical Sessile
fixed in one place, immobile

3. Nervous System Nervous system absent
Only multicellular animal without nervous system
Touch or pressure to outside causes a contraction

4. Digestive System Filter Feeding Drawn in through ostia
Flow out through osculum
Rely on water for food and oxygen

5. Filter Feeding Video 5:26

6. Excretory System Diffusion Absorb oxygen from water
Ammonia & CO2 diffuse
Go to surrounding water

7. Circulatory System Diffusion Water based No blood
Water passes through cells

8. Respiratory System Diffusion Take oxygen from water Use as nutrients

9. Support/Skeletal System
Absent
Spicules
provide structural support
deter predators

10. Reproductive System Sexual both male & female sperm released
travels to female
Asexual
gemmules
internal buds
reproduce mass of cells

11. Three Main Classes Hexactinellida
have 4 or 6 pointed siliceous spicules
glass sponges
cannot contract
found in Antarctic

12. Three Main Classes Demospongiae most diverse class 90% of all species
silica & spongin fibers

13. Three Main Classes Calcarea spicules made of calcium carbonate
in the form of calcite or aragonite
found in tropics

14. Other Facts Porifera latin for bearing pores 99% live in marine water
Some in fresh water

15. Definitions Spicule structural element in most sponges provide support
deter predators
CaCO2 spikes used for support

16. Definitions Collar Cell sticky funnel shaped collar
hairlike whip (flagellum)
engulfs & collects food

17. Definitions Amebocyte mobile cell in body of invertebrates
defense against pathogens
resemble ameobes
carry nutrients

18. Diagram

19. In Class Photos