Ppt

1. Daily Activity 4-12-2012
• Get out your notebooks and be
prepared to take notes on Cnidaria.

2. Phylum Porifera
Sponges
Phylum Cnidaria
Jellyfish, corals .....

3. • Don’t forget – sponges are
animals and belong to the
Animal Kingdom
1. Multicellular
2. No organs or body systems
3 . Cellular digestion
(heterotrophic)
4. Asymmetry

4. Sponges
are
SESSILE –
they do not
move
They obtain
food by
FILTER
FEEDING

5. Reproduce sexually (sperm and eggs)
Reproduce asexually (regeneration)
Skeleton composed of spongin (soft)
and spicules (hard)

6. Sponge Anatomy

8. Amebocytes - cells
within the sponge that
move around
supplying nutrients
and taking away
waste

9. Pacific Northwest Locals
Purple Sponge

10. Cnidarians - jellyfish, coral, hydra,
sea anemone
*Named after the stinging cells found on
their tentacles called CNIDOCYTES

11. Characteristics of Cnidarians
· Tentacles
· Cnidocytes (stinging cells)

12. · Nematocysts
(barbs)
· Gastrovascular
cavity (digestion)

13. Most Cnidarians have radial symmetry

14. Cnidarians have two body forms:
polyp (vase shaped) medusa (cup shaped)

15. Portuguese Man of War - cnidarian that floats in the
water and has long tentacles

18. Pacific Northwest Locals
Egg Yolk Jellyfish
Giant Lion’s Mane Jellyfish
http://www.calvintang.com/blog/2007/06/giant-jellyfish
Fish Eating Anemone
Crimson Anemone
White Spotted Rose
Anemone

19. The Hydra is a freshwater cnidarian
What kind of symmetry does hydra have?
Is it a medusa or a polyp?

20. Hydra
• Predatory animals
• They can be found in most unpolluted fresh-
water ponds, lakes, and streams in the temperate
and tropical regions and can be found by gently
sweeping a collecting net through weedy areas.
• Hydras are generally sedentary or sessile, but do
occasionally move quite readily, especially
when hunting.

21. Video of hydra at
http://www.microscopyu.com/moviegallery/pondscum/hydra/

22. Pacific Northwest Locals
Pink Mouth Hydroid

23. Coral Reefs are made from the skeletons of
cnidarians

26. Pacific Northwest Locals
Cup Coral
Soft Coral

27. Multimedia
Sponge Images and Videos -
http://www.junglewalk.com/video/Sponge-movie.htm
Cnidarian Images and Videos -
http://www.junglewalk.com/video/Coelantrate-movie.htm
General Invertebrate Movies at National Geographic
--- really good video on the portuguese man of war (under
invertebrates)
Hydra Video at http://www.schooltube.com/video/55045/Hydra