Lecture_12_1_1_Chordata_2

Lecture_12_1_1_Chordata_2 - Chordata II Diversity&...

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Unformatted text preview: Chordata II: Diversity & adaptations Trends in early Chordate & Vertebrate Evolution 1. Increased cephalization 2. Increased activity levels 3. Increased tendency toward predatory life-style U r o c h o r d a t a C e p h a l a c h o r d a t a O s t r a c o d e r m s H a g f i s h e s P l a c o d e r m s C a r t i l a g i n o u s f i s h B o n y f i s h T e t r a p o d s L a m p r e y s 2 1 1:Vertebrae 2:Bone 3:Jaws 4: bone lost 3 Trends in early Chordate & Vertebrate Evolution 1. Increased cephalization 2. Increased activity levels 3. Increased tendency toward predatory life-style U r o c h o r d a t a C e p h a l a c h o r d a t a O s t r a c o d e r m s H a g f i s h e s P l a c o d e r m s C a r t i l a g i n o u s f i s h B o n y f i s h T e t r a p o d s L a m p r e y s 2 1 1:Vertebrae 2:Bone 3:Jaws 4: bone lost 3 4 Chondrichthyes (Cartilaginous fishes) Megalodon: major predator, 18-1.5 million years ago....
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This document was uploaded on 03/07/2010.

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Lecture_12_1_1_Chordata_2 - Chordata II Diversity&...

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