1. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Cephalopods Chambered Nautilus

2. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Cephalopods Chambered Nautilus Internal Chambers Simple Suture Pattern

3. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Cephalopods Ammonoid Cephalopod Complex Suture Pattern

4. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca The Cephalopod Eye

5. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Gastropods Shell and viscera twisted 180 above foot ("Torsion") Shell grows in asymmetrical spiral ("Lateral Coiling") Radula changes form and function in different lineages scraping plants grazing on plants scavenging animals hunting animals Early Cambrian to Recent

6. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Gastropods

7. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Gastropods

8. EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Chitons Ancestor is flattened, elongated Mantle and shell dominate head, foot Mantle produces shell in 8 plates Radula scrapes encrusting vegetation Late Cambrian to Recent

9. EARLY PALEOZOIC LIFE Metazoan Invertebrates Arthropoda Very large phylum Chitinous, external skeleton Segmented body Paired and jointed appendages Highly developed nervous system sensory organs

10. EARLY PALEOZOIC LIFE Metazoan Invertebrates Arthropoda

11. EARLY PALEOZOIC LIFE Metazoan Invertebrates Arthropoda Trilobites Swimming or crawling arthropods Three longitudinal segments 2 pleural lobes, axial lobe cephalon, (head), thorax, and pygidium (tail) Flexible skeleton chitin and CaCO 3 Complex eye Early Cambrian to late Devonian extinct at Permian

12. EARLY PALEOZOIC LIFE Metazoan Invertebrates Arthropoda Trilobites Eye structure

13. EARLY PALEOZOIC LIFE Metazoan Invertebrates Arthropoda Ostracodes Look like beans Segmented body enclosed in CaCO 3 and chitin carapace Marine and freshwater Useful in biostratigraphy Early Cambrian to Recent

14. EARLY PALEOZOIC LIFE Metazoan Invertebrates Arthropoda Eurypterids Swimming or crawling arthropods Some up to 3 m in length Ordovician to Permian Mostly Silurian and Devonian

15. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata Spiny-skinned animals Starfish, sea urchins sea lilies 5 part, radial symmetry Endoskeleton CaCO 3 plates Water vascular system tube feet

16. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata

17. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata Sessile, benthonic forms common in Paleozoic Vagrant, benthonic forms common in Mesozoic and Cenozoic

18. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata Asteroidea Starfish Ordovician to Recent

19. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata Ophiuroidea Brittle Stars Ordovician to Recent

20. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata Echinoidea Sea Urchins Early Cambrian to Recent

21. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata Crinoidea Crinoids Middle Cambrian to Recent

22. EARLY PALEOZOIC LIFE Metazoan Invertebrates Echinodermata Blastoidea Blastoids Early Cambrian to Permian

23. EARLY PALEOZOIC LIFE Metazoan Invertebrates Graptolithina (Graptolites) Marine Planktonic or epiplanktonic Sessile benthonic Chitin skeleton Cambrian to Mississippian? Good index fossil for Ord-Sil

24. EARLY PALEOZOIC LIFE Metazoan Invertebrates Graptolithina (Graptolites)

25. EARLY PALEOZOIC LIFE Vertebrates Fish

26. EARLY PALEOZOIC LIFE Vertebrates Fish Agnatha (Agnathids) Jawless fish Cambrian to Recent

27. EARLY PALEOZOIC LIFE Vertebrates Fish Agnatha (Agnathids) Jawless fish Astrapis

28. EARLY PALEOZOIC LIFE Vertebrates Fish Acanthodii (Acanthodians) Early jawed fish Late Silurian to Permian

29. EARLY PALEOZOIC LIFE Vertebrates Fish Placodermi (Placoderms) Plate-skinned fishes Late Silurian to Permian Bothryolepis

30. EARLY PALEOZOIC LIFE Vertebrates Fish Placodermi (Placoderms) Dunkleosteus

31. EARLY PALEOZOIC LIFE Vertebrates Conodonts Chordate Resemble teeth Proterozoic to Triassic Calcium phosphate

32. EARLY PALEOZOIC LIFE Vertebrates Conodonts

33. EARLY PALEOZOIC LIFE Vertebrates Conodonts