1. Invertebrates
Summary

2. Symmetry

3. Diploblastic vs Triploblastic
Endoderm
Digestive
Respiratory
Ectoderm
Outer covering
Nervous
Mesoderm
Muscles
Circulatory
Skeletal

4. Embryonic Development

5. Body Cavity

6. Blastopore Devlopment

8. Porifera

9. Porifera Asymmetrical No true tissue No body cavity Sessile
Filter feeders

11. Cnidaria Diploblastic No body cavity Radial symmetry
Gastrovascular cavity
Nematocysts

15. Platyhelminthes Bilateral symmetry Triploblastic Protostome Acoelomate
Cephalized
Flame cells maintain osmotic balance
Mouth, pharynx, & gastrovascular cavity

17. Nematoda Bilateral symmetry Cephalized Triploblastic Protostome
Pseudocoelomate
Nematoda

18. Mollusca Bilateral symmetry Triploblastic Protostome Coelomate
Open circulation
Nephridia
Gills
Class Gastropoda Class Bivalvia Class Cephalopoda
Mollusca

19. Mantle, Foot, & Visceral Mass

20. Annelida

21. Annelida
Bilateral symmetry Triploblastic Coelomate Protostome Segmentation Closed circulation Respiratory skin Esophagus, crop, gizzard Nephridia (2 per segment)

22. Arthropoda Triploblastic Protostome Coelomate Open circulation
Exoskeleton
Jointed appendages
Gills, Tracheal system, or book lungs
Malpighian tubules

23. Arthropoda Class Crustacea Class Arachna Class Insecta Intestine
Digestive
gland
Intestine
Heart
Stomach
Brain
Eyes
Poison
Pedipalp
Chelicera
Book lung
Sperm
receptacle
Gonopore
(exit for eggs)
Silk gland
Spinnerets
Anus
Ovary
Figure 33.32

25. Complete Metamorphosis
Larva (caterpillar)
(a)
(b) Pupa
(c) Pupa
(d) Emerging adult
(e) Adult
Figure 33.6a–e

26. Ecdysis

27. Echinoderms
Radial or bilateral symmetry Triploblastic Coelomate Deuterostome Endoskeleton Water vascular system Tube feet