The document discusses the characteristics of sponges. It notes that sponges are the simplest of animals, with no organs or senses. However, they are classified as animals because they are multicellular, their cells have specialized functions and lack cell walls, they are heterotrophic, and their larvae are motile. The document describes sponges' anatomy, noting they are filter feeders that draw water through pores using flagella. It also discusses sponge spicules, which form their skeleton, and their reproduction, which can occur asexually and sexually through budding.

1. Figure 33.2 Sponges

2. Sponges (Phylum Porifera) the simplest of all animals

3. Sponges (Phylum Porifera) the simplest of all animals They have no organs of any kind

4. Sponges (Phylum Porifera) the simplest of all animals They have no organs of any kind They have no senses

5. Sponges (Phylum Porifera) the simplest of all animals They have no organs of any kind They have no senses So, what makes them an animal?

6. Sponges are animals because:

7. Sponges are animals because: they’re multicellular

8. Sponges are animals because: they’re multicellular their cells are differentiated and have specialized function s

9. Sponges are animals because: they’re multicellular their cells are differentiated and have specialized function s their cells have no cell walls

10. Sponges are animals because: they’re multicellular their cells are differentiated and have specialized function s their cells have no cell walls they’re heterotrophic

11. Sponges are animals because: they’re multicellular their cells are differentiated and have specialized function s their cells have no cell walls they’re heterotrophic their larvae are motile

12. Figure 33.3 Anatomy of a sponge

14. Sponges are filter feeders:

15. Sponges are filter feeders: makes sense for a sessile organism

16. Sponges are filter feeders: makes sense for a sessile organism collar cells have flagella that create a current which draws water through the pores

17. Sponges are filter feeders: makes sense for a sessile organism collar cells have flagella that create a current which draws water through the pores small particles get caught in collar cells

18. Sponges are filter feeders: makes sense for a sessile organism collar cells have flagella that create a current which draws water through the pores small particles get caught in collar cells special amoebocytes engulf particles

19. Sponges are filter feeders: makes sense for a sessile organism collar cells have flagella that create a current which draws water through the pores small particles get caught in collar cells special amoebocytes engulf particles amoebocytes are a link to the sponge protist ancestry

20. Sponges are filter feeders: makes sense for a sessile organism collar cells have flagella that create a current which draws water through the pores small particles get caught in collar cells special amoebocytes engulf particles amoebocytes are a link to the sponge protist ancestry also aid in reproduction and creating spicules

21. http://www.pbs.org/kcet/shapeoflife/episodes/origins_explo1.html

22. Sponge Spicules

23. Spicules are like a sponge’s skeleton

24. Spicules are like a sponge’s skeleton small, structures that come in a variety of shapes

25. Spicules are like a sponge’s skeleton small, structures that come in a variety of shapes often needle-like

26. Spicules are like a sponge’s skeleton small, structures that come in a variety of shapes often needle-like located between cell layers

27. Spicules are like a sponge’s skeleton small, structures that come in a variety of shapes often needle-like located between cell layers form a hard support system for the sponge’s body

29. Sponge reproduction

30. Sponge reproduction asexual

31. Sponge reproduction asexual sexual

32. Sponge reproduction asexual sexual budding

33. Sponge reproduction asexual sexual budding amazing powers of regeneration

34. Sponge reproduction asexual sexual budding amazing powers of regeneration hermaphrodites

35. Sponge reproduction asexual sexual budding amazing powers of regeneration hermaphrodites fertilization mostly internal

36. Sponges were likely the first true animal on planet Earth.

37. http://www.pbs.org/kcet/shapeoflife/episodes/origins_explo2.html