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Class Chondrichthyes

Class Chondrichthyes

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Class Chondrichthyes

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  1. Class Chondrichthyes • “Cartilaginous Fish” • Skeleton made of cartilage • Movable jaws with well-developed teeth • Rough sand paper like scales made of the same composition of the teeth

  2. Sharks & Ratfish • Sharks • Adapted for fast swimming and to be predators • Ratfish or Chimeras • Bottom dwellers • Have long “rat-like” tails

  3. Rays and Skates • Rays • Flattened bodies with gills on the bottom of their bodies • Whip-like tail with stinging spines (venomous) • Skates • Very similar to rays but with out the long tail or stinging spines

  4. Class Osteichthyes • “Bony Fish” • Make of 98% of all fish and over half the vertebrates • Skeleton at least made partially of bone • Thin, flexible, overlapping scales • Mouth located at end of body • Presence of gas-filled sac called a swim bladder

  5. Body Shape • Body shape is varied and linked to its lifestyle • Fast swimmer need elongated bodies

  6. Body Shape • Short, compressed bodies good for navigating tight places like reefs • Bottom dwellers tend to have flattened shapes

  7. Body Shape • Elongated shapes are need for life in narrow spaces • Some have less generalized shapes

  8. Body Shape • Some shapes are conducive to camouflage with their environment

  9. Exterior Layer