1. Invertebrate Animals

2. Phylum Porifera Multicellular Body with pores (ostia)
No organs or true tissues.
No nervous system
Adults sessile & attached to substratum.

3. Simple Sponge Morphology
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Simple Sponge Morphology

4. Physiology Large sponges filter 1500 liters/day
Choanocytes phagocytize
Archeocytes digest
No respiratory, excretory or nervous systems

5. Sexual Reproduction Monoecious Sperm and egg derived from choanocytes
Both male and female
Sperm and egg derived from choanocytes
Ciliated larva
Swim to new location

6. Asexual Reproduction Budding Micropyle Spicule Fragmentation
Gemmule formation
-survive freezing
Spicule

7. Phylum Cnidaria Mouth at oral end surrounded by tentacles.
One opening into and out of gastrovascular cavity.
Stinging cells that discharge pneumatocysts

8. Generalized Cnidarian Life Cycle
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Generalized Cnidarian Life Cycle

9. Cnidocyte Structure and Nematocyst Discharge
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Cnidocyte Structure and Nematocyst Discharge

10. Symbiosis

11. Coral Reefs
Formed over thousands of years from successive layers of coral skeleton deposits

12. Phylum Platyhelminthes
Flat worms
One opening for digestive system

13. Copyright © The McGraw-Hill Companies, Inc
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Chinese Liver Fluke

14. Phylum Nematoda 12,000 species Cylindrical body Mouth and anus
500,000 possible
Cylindrical body
Mouth and anus

15. Ascaris lumbricoides Roundworm of man 1.2 billion people
Many in southeast US
Females lay 200,000 eggs a day
Unsanitary habits contaminate ground
Night soil

16. Life Cycle of Ascaris Lumbricoides
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Life Cycle of Ascaris Lumbricoides
Source: Redrawn From Centers for Disease Control, Atlanta, GA.

17. Enterobius vermicularis
Pin worm
50% of children in US
Spread
Fecal oral route
airborne

18. Wuchereria bancrofti Lives in lymphatic system
Obstruct lymph to cause swelling
Elephantiasis

19. Elephantiasis

20. Loa loa
Eye worm

21. Dracunculus medinesis
Fiery serpent

22. Phylum Annelida Segmented body Coelom divided by septa
Closed circulatory system

23. Septa

24. Leech Oral and ventral sucker Most live in fresh water Feed
Invertebrates
Body fluids
Blood

25. Phylum Mollusca 50,000 -100,000 living species Largest = 1000 pounds
Most have a shell
Foot for movement

26. Phylum Arthropoda
Segmented body
Jointed appendages
Exoskeleton

27. Arthropods Most Successful Animals
Number of species
Diversity

28. Spiders and Insects

29. Latrodectus mactans
Black widow spider
Neurotoxin

30. Loxosceles reclusa Fiddle back spider Necrotoxin Brown recluse Brown
Violin
Necrotoxin

31. Loxosceles reclusa
Necrosis of tissue

32. Day 9

33. Day 10

34. Ticks and Mites

35. Lobster

36. Harmful Insects
Tent catepillar
Pest of many trees and shrubs

37. Harmful Insects
Boll weevil
Destroys cotton

38. Harmful Insects Mosquitos Vector Malaria Yellow fever Encephalitis
West Nile virus

39. Harmful Insects
Flea
Vector for
Plague

40. Xenopsylla Cheopis
Rat flea
Vector for plague

41. Black Death 1357-1350 killed 25,000,000 in Europe
1900’s killed 20,000,000 in India

42. Bubos

43. Plague Survivor

45. Phylum Echinodermata
Radial symmetry
No head or brain
Spiny skin

46. The End