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Sharks

Sharks. Organization of Life. Phylogenetic relationship of animals. Classification of fishes. General Info - Sharks. Kingdom: Animalia Phylum: Chordata Class: Chondrichthyes Subclass: Elasmobranchii (sharks, rays, ratfishes)

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Sharks

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  1. Sharks

  2. Organization of Life

  3. Phylogenetic relationship of animals

  4. Classification of fishes

  5. General Info - Sharks • 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) • 350 living species

  6. Shark Diversity

  7. Shark Anatomy

  8. Body type dependent upon habitat Gray Reef Shark Goblin Shark

  9. Shark Jaws and Teeth

  10. Shark Fins Bursts of power Constant speed

  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

  14. Ampullae of Lorinzini

  15. Ampullae of Lorinzini

  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

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