1. Invertebrate Overview

2. Body Symmetry
Radial Symmetry-body parts that repeat around center body-Cnidaria and Echinodermata
Bilateral Symmetry-imaginary plane divides animal into to equal parts-Platylhelminthes ,Nematoda,Annelida,Mollusks,Arthropoda
Asymmetrical-no front back or sides-Porifera

3. Radial Symmetry

5. Bilateral-

6. Phylum Porifera Pores all over the body Multicellular Heterotrophic
No cell walls
Coanocytes-specialized cells that use flagella to move water through
Spicules-in some sponges and is a hard-skeleton –like substance
No particular nervous system
Reproduction is internal fertilization,larvae released into water
Gemmules-layer of archaeocytes surrounded by spicules—asexual budding under harsh conditions

10. asymmetrical

11. Cnidaria Hydra,jellyfish,corals,sea anemones
1)Class Scyphozoa-jellyfish-reproduce sexually/seen mostly as medusa
2)Class hydrozoas-hydras(fresh water)
,Portugese-Man-of-War-mostly in polyp stage
3)class Anthozoa-sea anemone and corals-only polyp stage-reproduce asexually by releasing eggs and sperm into water/some can reproduce asexually

12. Reproduce externally
2 stages-polyp and medusa
Stinging cells-nematocysts

14. Platylhelminthes Flatworms Flukes,planaria and tapeworms
3 classes: 1)turbellaria-planaria/ 2)Trematoda-flukes-parasitic/ 3)cestoda
Hermaphrodites that reproduce sexually
Regeneration

17. Phylum Nematoda-roundworms

18. Nematoda Some are parasitic
Reproduce sexually and usually have separate sexes
Parasitic varieties include ones causing trichinosis,filarial,ascarid and hookworms
Sexual reproduction,other systems have also made advances

22. Phylum Annelida Class Oligochaetes-earthworms Class Hirudinea-leeches
Class Polychaetes-sandworms and bloodworms
Most reproduce sexually
2 major groups of muscles
Nephridia

25. Phylum Mollusca
Soft-bodied animals that usually have an external or external shell
Body usually has 4 parts-foot,mantle,shell and visceral mass
1)class Gastropoda-snails and slugs/shell-less or single shell/muscular foot
2) Bivalves-2 shells held by muscle…clams,etc.
3) Cephalopods-soft bodied w/tentacles—octupi and squids

28. Phylum Arthropoda Insects,crabs,lobsters,shrimp,spiders
All have a tough exoskeleton
1)subphylum-Crustacea-attenae,3 body sections,chewing mandibles/crayfish,etc,
2)subphlum chelicerata-horseshoe crabs,spiders,ticks,scorpions-2 body sections and 4 pairs of walking legs
3) subphylum Uniramians-1pair attenae and unbranched appendages-insects