Lecture 5 - Vertebrate Evolutionary History &...

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Unformatted text preview: Vertebrate Evolutionary History & Characteristics ventral aorta heart liver intestine kidneys dorsal aorta(e) gill pouches anterior cardinals intestinal artery hepatic portal vein caudal artery & vein posterior cardinals common cardinal Diagrammatic view of lamprey circulation anterior posterior hepatic vein Vertebrate Evolutionary History & Characteristics AGNATHAN (JAWLESS) VERTEBRATES JAWED VERTEBRATES lampreys hagfish Extinct lampreys Conodonts Ostracoderms Cambrian Devonian Recent Cyclostomes Vertebrate Evolutionary History & Characteristics Ostracoderms Ordovician-Devonian Extinct Ancestral to jawed verts Anatomical characters jawless dermal bone size marine? fusiform or d-v flat spines Vertebrate Evolutionary History & Characteristics Ostracoderms: dorsal view of head (left) and ventral view (right). Vertebrate Evolutionary History & Characteristics AGNATHAN (JAWLESS) VERTEBRATES JAWED VERTEBRATES lampreys hagfish Extinct lampreys Conodonts Ostracoderms Cambrian Devonian Recent Cyclostomes Vertebrate Evolutionary History &...
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Lecture 5 - Vertebrate Evolutionary History &...

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