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Deuterostomes

Deuterostomes. Phylum Echinodermata. Water vascular system. Starfish moving view from aboral surface Starfish moving view from oral surface. Note bilateral larvae!. Phylum Chordata. Pharyngeal gill slits Dorsal hollow nerve cord Notochord Muscular, post-anal tail. Phylum Chordata.

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Deuterostomes

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  1. Deuterostomes

  2. Phylum Echinodermata

  3. Water vascular system Starfish moving view from aboral surface Starfish moving view from oral surface

  4. Note bilateral larvae!

  5. Phylum Chordata

  6. Pharyngeal gill slits Dorsal hollow nerve cord Notochord Muscular, post-anal tail Phylum Chordata (a) Cephalochordates Adult Water flow Water flow (b) Urochordates Larva Adult (c) Vertebrates Cross section of embryo Embryo Pharyngeal pouches become gill slits in aquatic vertebrates

  7. Subphylum Urochordates – sea squirts

  8. Subphylum Cephalochordate – lancelets; amphioxus

  9. cartilage bone

  10. Urochordate larva cephalochordate Jawless fish Lung fish Drepanaspis – bony skull Bony fish Cartilaginous fish

  11. Eusthenopteron (~385 mya) Lobe-like fin Panderichthys (~380 mya) Tiktaalik (~375 mya) Fin to limb evolution Acanthostega (~365 mya) Tulerpeton (~362 mya) Limb that can support walking on land

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