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Lecture 20

Lecture 20 - Evolution of Fish

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Earth Sciences
Earth Sciences 1083F/G
Cameron Tsujita

Lecture 20Evolution of Fishes y Origin of Fish o Origin of fishes can be traced to the first chordates o Lacked a backbone but possessed a flexible rod of tissue called a notochord o Have the basic wormlike body plan muscle packs and a pharynx y General Picture o Earliest fishes were jawless o Jawed fishes arose from jawless fishes o The diversity of major fish groups peaked in the Devonian PeriodThis period is therefore often referred to as The Age of Fishes y First True Fishes Jawless Fishes Agnatha o Ostracoderms ancient armoured forms o Range CambrianCarboniferous o Had heavy external armour but a soft cartilaginous internal skeleton o Representatives of the jawless fishes have
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