2. Organization of Life

3. Phylogenetic relationship of animals

4. Classification of fishes

5. Kingdom: Animalia Phylum: Chordata Class: Chondrichthyes Subclass: Elasmobranchii (sharks, rays, ratfishes) 100 million years old (current species, ancient relatives up to 400-450 million years old) 400 living species General Info - Sharks

6. Shark Diversity

7. Shark Anatomy

8. Body type dependent upon habitat Gray Reef Shark

9. Shark Jaws and Teeth

10. Shark Fins Constant speed Bursts of power

11. Shark “Skin” Dermal denticles a.k.a Placoid scales

12. Sensory organs Olfactory sacs on both sides of head – nares (nostrils) Can sense substances at 1 ppm Ampullae of Lorenzini – detect weak electrical fields Lateral line – detect vibrations in the water Canals that run along the head and body lined with sensory cells called neuromasts that sense vibration Can see pores on surface of body Inner ear

13. Ampullae of Lorinzini

15. Shark Senses

16. Lateral Line

17. Shark Reproduction Internal fertilization Males – claspers Females - cloaca pc.maricopa.edu

18. Shark Reproduction Oviparous – embryo enclosed in large, leathery egg case (mermaid’s purse); ~43% of cartilaginous fishes

19. Shark Reproduction Ovoviviparous – female retains eggs inside reproductive tract for additional protection. Give birth to live young. 300 embroys/1 whale shark Sandtiger sharks consume yolk and then eat brothers and sisters to survive. Viviparous – live young. Embryos absorb nutrients from the walls of mother’s reproductive tract.

20. Shark behavior We’ll hear that from you! apexpredators.com Photos: wikipedia.com