vertebrate_history_2010

vertebrate_history_2010 - A Brief History of the...

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A Brief History of the Vertebrates Common ancestor of all these?
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Vertebrates are in the Phylum Chordata Sponges, jellyfsh (Clams, worms, arthropods) (Starfsh, vertebrates) Vertebrates Starfsh, urchins Acorn worms Our closest invertebrate relatives are the Cephalochordates. CHORDATA
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1) presence of a notochord* (precursor to vertebral column) 2) dorsal hollow nerve cord* (spinal cord) 3) pharyngeal gill slits* 4) muscular post-anal tail* 5) presence of a head SHARED PRIMITIVE CHARACTERS OF VERTEBRATES * present in cephalochordates. Amphioxus
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NOTOCHORD DORSAL HOLLOW NERVE CORD POST ANAL TAIL PHARYNGEAL GILL SLITS PAKAIA : 530 Ma, Burgess Shale Amphioxus
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Haikouella from the Early Cambrian of China (about 4 cm long) Another early proto-vertebrate ?
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Five major breakthroughs in vertebrate history: 1) evolution of bone 2) evolution of jaws 3) evolution of lungs and limbs 4) evolution of the amniotic egg 5) evolution of endothermy Early evidence of vertebrates: Bone fragment from the armor of a jawless Fsh. circa 500 Ma -Early Ordovician
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Ordovician (circa 450 ma) jawless fsh 1) EVOLUTION OF BONE - WHY? Protection ±rom predators Mineral storage (phosphorus) )
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Paleozoic jawless fsh AGNATHA = jawless fshes Lamprey swimming Lamprey Feeding
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Jawless fishes ruled the seas for about 100 million years, but were replaced by: FISHES WITH JAWS! In the late Silurian and Devonian Five major breakthroughs in vertebrate history: 1) evolution of bone 2) evolution of jaws 3) evolution of lungs and limbs 4) evolution of the amniotic egg 5) evolution of endothermy
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2) EVOLUTION OF JAWS WHY EVOLVE JAWS? 1) stronger bite (defense / predation). 2) expands resources that you can eat.
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Who are these early jawed fishes? The earliest representatives of the two major fish groups around today: Osteichthyes (Bony Fishes) Chondrichthyes (Cartilaginous fishes)
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vertebrate_history_2010 - A Brief History of the...

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