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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES. Hagfishes represent the next level in chordate complexity….why?. Hagfishes. The only animal with cranium but back-boneless Sensory tentacles surround their fleshy mouth Tongue rasps on their prey’s soft tissues.

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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

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  1. Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES

  2. Hagfishes represent the next level in chordate complexity….why?

  3. Hagfishes • The only animal with cranium but back-boneless • Sensory tentacles surround their fleshy mouth • Tongue rasps on their prey’s soft tissues. • Draws small invertebrate prey and tissues of a dead or dying fish into its mouth. • Non-active animals; low metabolic rates • Release sticky mucus once disturbed, fending off possible predators

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