1. Invertebrate Groups Simplest animals Contains the greatest number of animal species Most found in water Do not have a backbone Includes sponges, cnidarians, flatworms, roundworms, annelids (segmented worms), mollusks, arthropods, & echinoderms

2. CLASSIFICATION SCHEME KINGDOM PHYLUM CLASS ORDER FAMILY GENUS SPECIES

3. PHYLUM PORIFERA MEANS “PORE BEARING”

4. PHYLUM MEANS “STINGING CELLS” CNIDARIA

5. PHYLUM NEMATODA “ROUNDWORM” MEANS PINWORMS HOOKWORMS TRICHINELLA

6. PHYLUM PLATYHELMINTHES MEANS “FLATWORMS” PLANARIAN

7. PHYLUM MOLLUSCA MEANS-SOFT-BODIED

8. CLASS GASTROPODA MEANS: STOMACH-FOOTED

9. CLASS BIVALVIA MEANS: TWO-SHELLED SCALLOP

10. CLASS CEPHALOPODA MEANS: HEAD-FOOTED

11. PHYLUM ANNELIDA MEANS: SEGMENTED

12. PHYLUM ARTHROPODA MEANS: JOINTED APPENDAGES

13. PHYLUM ECHINODERMA MEANS SPINY-SKINNED

14. -poda - footed Bi- two Echino- spiny Poly- many -derma - skin Cephalo- head Gastro- stomach -valvia - shell Pori- pores