1. Invertebrates

2. Characteristics Invertebrates are animals that do not have backbones.
97 % of the animal kingdom is made up of invertebrates.
Insects and some other invertebrates have exoskeletons.
Symmetry

3. Invertebrate Phyla Sponges Cnidarians Platyhelminthes Nematodes
Mollusks
Annelids
Echinoderms
Arthropods

4. Sponges (Porifera) Cells relatively independent Mostly marine
No Symmetry (asymmetrical)
Adults are sessile
no true tissues or organs (most primitive animals)
have some regeneration capabilities
filter feeders
asexual reproduction by buds and sexual reproduction

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6. Cnidarians (jellyfish, sea anemones, corals, gorgonians, hydroids)
Mostly marine
Radial Symmetry
cells called cnidocytes, which contain stinging structures called nematocysts; used for prey capture and defense
many possess dinoflagellates or green algae, resulting in a symbiotic relationship
asexual reproduction by budding or sexual reproduction

7. Cnidarians
Jellyfish
Hydra
Coral
Sea anemone
Portuguese Man-O-War

8. Portuguese man-of-war

9. Portuguese man-of-war attack

11. Giant jellyfish

12. Platyhelminthes Flatworms Bilateral symmetry Unsegmented body
flattened dorsoventrally
possess a two-way gut
move by contracting muscles (glides over rocks through water)
carnivorous
capable of regeneration
sexual reproduction (usually hermaphroditic), some reproduce asexually by fission

13. Intestinal fluke

14. Liver flukes – white-tail deer

16. Planarian – freshwater flatworm

17. Nematodes (roundworms)
No segmentation
A one-way digestive tract from mouth to anus.
Most are free-living; found in soil where they are important decomposers.
Some are parasitic, including
Hookworms, pinworms
filarial worms — parasitic worms that cause:
river blindness, elephantiasis, guinea worm

24. Mollusks Clams, snails, squids bilaterally symmetrical
possess mantle which secretes the shell plates or shells
large, well defined muscular foot, often with a flattened creeping sole
possess a one-way gut
sexual reproduction
Varied habitats
Marine
Freshwater
Terrestrial

25. Octopuses

26. Blue Ringed Octopus The most venous octopus.
This small mollusc lives in warm, shallow reefs off the coast of Australia, new Guinea, Indonesia and the Philippines. 
It has a life span of about one and a half years.

27. Nautiluses

28. Cuttlefishes

29.
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30. Annelids Segmented worms Common earthworm Leech
bilaterally symmetrical
possess a one-way gut
each segment contains a pair of appendages called parapodia (used for movement and gas exchange)
sexual reproduction

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32. http://animals. howstuffworks
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33. Arthropods External skeleton Huge variation – mostly insects
bilateral symmetry, metameric segmented body, each with a pair of jointed appendages
most have regional body specialization
usually possess compound eyes
exoskeleton made of chitin and must be shed in order to grow
possess a one-way gut

35. Great Hairy Scorpion – largest in US (up to 6”)

36. Scorpion’s glow under black light

37. Lobsters

38. Barnacles

39. Krill

40. Crabs

42. Millipede

43. Grasshopper

44. Praying Mantis eating Grasshopper

45. Queen Bee

46. Drone Bee

47. Worker bee with pollen

48. Echinoderms means “spiny skin” exclusively marine
adults have pentamerous radial symmetry – larva are bilaterally symmetrical
body organized about an oral-aboral axis
water vascular system composed of a complex series of fluid-filled canals (used for locomotion and respiration)
sexual reproduction or asexual reproduction by regeneration