Shark Lecture

Shark Lecture - Ratfishes Sharks Skates and Rays Class...

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Ratfishes, Sharks, Skates, and Rays Class Chondrichthyes: Subclasses Holocephali and Elasmobranchii Chondrichthyes ± Held in low regard ± Considered viscous, inedible, and primitive ± Not generally true ± Group is not primitive ± As specialized as teleosts, but in their own way Chondrichthyes II ± Less diverse than teleosts ± Most spp are predators on large invertebrates and fishes ± Extreme diversity in ways of making a living is lacking ± As predators their success is undisputed ± Success due to a combination of characters Structural & Physiological Adaptations ± Buoyancy ± Respiration ± External Covering ± Feeding ± Movement ± Sensory Systems ± Osmoregulation ± Reproduction
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