1. Review Questions 1) What are 4 characteristics that all animals share?
2) Contrast invertebrates with vertebrates
3) What is the difference between the blastula and gastrula stages of development in most animals?

2. Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria
Platyhelminthes
Nematoda
Annelida
Mollusca
Echinodermata

3. Invertebrates II Porifera (sponges) lack true tissue (organs)
mostly marine
Sessile
body: sac with pores
feeding: filter thru pores
no nervous system
asexual OR sexual reproduction

4. Invertebrates II Filter Feeding Collar Cells- contain flagella
that pulls water in
and traps food
Amoebocytes- engulfs the food
(mostly bacteria)
Feeding Animation

6. Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria
Platyhelminthes
Nematoda
Annelida
Mollusca
Echinodermata

7. Invertebrates II Cnidaria jellyfish, hydras, sea anemones, coral
Sessile or slow-moving
digestive sac (1 opening)
Carnivorous
Radial symmetry

8. Invertebrates II Cnidaria
cnidocytes w/ nematocysts: disable/sting prey
simple nerve net to respond to stimuli
basic specialized tissue

9. Invertebrates II
2 forms: polyp & medusa

11. Killer Jellyfish
Stinging animation
Video trailer

12. Online Activities Phsuccessnet.com 23.1 Characterize animals
23.2 Explore sponges
23.3 Explore cnidarians

13. Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria
Platyhelminthes (flatworms)
Nematoda
Annelida
Mollusca
Echinodermata

14. Invertebrates II Platyhelminthes (flat worms)
examples: planaria, tapeworms & flukes (parasites)
bilaterally symmetric
has muscle tissue
nerve clusters
gastrovascular cavity w/ one opening
asexual OR sexual; hermaphroditic

16. Invertebrates II Platyhelminthes acoelomate moves directionally
no need for circ. system b/c of flat shape
has head w/ eyespots

17. Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria
Platyhelminthes (flatworms)
Nematoda (round worms)
Annelida
Mollusca
Echinodermata

18. Invertebrates II Nematoda (roundworms) bilaterally symmetric
complete digestive tract (2 openings)
important decomposers
causes trichinosis in humans
pseudocoelom

20. Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria
Platyhelminthes (flatworms)
Nematoda (round worms)
Annelida (segmented worms)
Mollusca
Echinodermata

21. Invertebrates II
Segmented worms (earthworms, tubeworms, leeches, etc.)
coelom
complete digestive system with
surrounding closed circulatory system
digestive system has specialized regions
has tubes for removing waste from blood
brainlike structure
Worm Video

22. Earthworm Dissection Dorsal (back)/ Ventral (front)
Anterior (top)/ Posterior (bottom)
Segments/ Setae/ Nephridiopores
Clitellum

23. Earthworm Dissection Place on ventral (flattened) side
Make a thin cut in the middle from clitellum to mouth
Pin down sides.

24. Earthworm Dissection Septa Digestive System Hearts
Cerebral ganglia (brain)/
Ventral Nerve Cord
Seminal Vesicles

25. Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria
Platyhelminthes (flatworms)
Nematoda (round worms)
Annelida (segmented worms)
Mollusca
Echinodermata

26. Invertebrates II Mollusks
snails, slugs, oysters, clams, octopi, squid, etc,
coelomates
open circulatory system

27. Body of a Mollusk Foot- locomotion
Mantle- produces shell; respiration; waste disposal, sensory reception; (gill)
Radula- extends from mouth to feed

28. Diversity of Mollusks
Gastropod- single, spiral-shaped shell, mostly marine; snails & slugs
Bivalves- shells with 2 halves; clams, oysters, mussels, scallops
Cephalopods- fast, agile, shell is small and internal or missing; squid, octopi

29. What mollusk class am I??

30. What mollusk class am I??

31. What mollusk class am I??

32. Invertebrates II Focus Phyla: Porifera (sponges) Cnidaria
Platyhelminthes (flatworms)
Nematoda (round worms)
Annelida (segmented worms)
Mollusca
Echinodermata (starfish, etc)

33. Invertebrates II Echinoderms
lack body segments, and in most adult forms, the external parts of the animal radiate from the center like spokes of a wheel (radial symmetry)
Rough & spiny surface

34. Invertebrates II Hard internal skeleton (endoskeleton) deuterostomes
water vascular system
tube feet for moving, gas exchange, eating

35. Invertebrates II Echinoderms sexual reproduction (sperm/eggs in water)
regenerate
examples: sea stars, brittle stars, sea urchins, sand dollars, sea lillies, sea cucumbers, sea daisy

36. Review
Log on to phsuccessnet.com and complete online activities 23.7 and 23.8.
When complete, write a summary paragraph on what you learned in each activity.

37. Mussel Dissection
Mussel Dissection

38. Starfish Dissection
Aboreal/ oral surfaces