1. INVERTEBRATES Ch

2. Include 95-97% of all animal species Without a backbone
Kingdom Animalia
Major Characteristics= eukaryotic, multi-cellular, heterotrophic, lack a cell wall
Invertebrates
Include 95-97% of all animal species
Without a backbone

3. Exoskeleton
Hard, tough outer covering that provides framework and support
Made of chitin

4. Endoskeleton
Internal skeleton

5. Inner layer of cells in the gastula
Endoderm
Inner layer of cells in the gastula
Develops into tissues and organs of the digestive tract

6. Outer layer of cells in the gastula
Ectoderm
Outer layer of cells in the gastula
Develops into skin and other body coverings and the nervous system

7. Between the endoderm and ectoderm Develops into skeletons and muscles
Mesoderm
Between the endoderm and ectoderm
Develops into skeletons and muscles

8. Provides open space inside of body
Coelom
Fluid filled cavity
Provides open space inside of body

9. Coelom

10. multiple body components
Segmentation
“put together”
Sections
multiple body components

11. Animals with anterior (head) & posterior (tail)
Cephalization
Animals with anterior (head) & posterior (tail)
Tendency to concentrate nervous and sensory organs at the anterior
Development of a specialized head

12. Asymmetry
Irregular shape
Ex. Sponge

13. Radial symmetry
Body plan in which parts repeat around an imaginary line drawn through the center
Ex. Cnidarians
(jellyfish)

14. Bilateral Symmetry
Body plan in which left and right sides are identical when an imaginary line is drawn through the center
Ex. Flatworm

15. Sponges Sessile: live entire adult life attached to a single spot
Very simple: no mouth, no organ systems
Rely on the movement of water through their bodies for
respiration, circulation, and excretion
Based on their shape, what is their symmetry?

16. Cnidarians Soft-bodied, carnivorous, stinging tentacles
Simplest animals to have body symmetry and specialized tissues
Based on their shape, what is their symmetry?

17. Platyhelminthes (Flatworms)
Soft, flattened worms
Simplest organisms to have cephalization
Based on their shape, what is their symmetry?

18. Nematoda (Roundworms)
Unsegmented worms
Have pseudocoeloms and digestive systems with two openings
Many are predators
Some act as parasites that affect humans
Based on their shape, what is their symmetry?

19. Mollusca Soft-bodied Usually have an internal or external shell
Based on their shape, what is their symmetry?

20. Annelida (Segmented Worms)
Worms with segmented bodies
Have a true
Based on their shape, what is their symmetry?

21. Arthropoda
Have a segmented body, tough exoskeleton, jointed appendages
Exoskeleton
Hard, tough outer covering that provides framework and support
Made of chitin

22. Arthropoda - Crustaceans
Two pairs of antennae, and two or three body sections
Have chewing mouthparts called mandibles
Based on their shape, what is their symmetry?

23. Arthropoda – Arachnids (Chelicerates)
Have mouthparts called chelicerae
Two body sections
Nearly all have four pairs of walking legs
Based on their shape, what is their symmetry?

24. Arthropoda - Insects Jaws One pair of antennae Three-part bodies
head, thorax, abdomen
legs attached to thorax
Based on their shape, what
is their symmetry?

25. Echinodermata Sea Cucumber Sea Urchin Spiny skin Internal skeleton
Water vascular system
Suction-cup “feet”
Based on their shape, what is their symmetry?
Sea Urchin

26. Circulatory Systems
Open circulatory system- a system in which blood vessels from the heart are not contained in blood vessels

27. Circulatory Systems
Closed circulatory system- a system in which blood is confined to vessels as it moves through the body