The Vertebrate Story, Part one BIOL 495 – Chapter Three.

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Presentation transcript:

The Vertebrate Story, Part one BIOL 495 – Chapter Three

Vertebrate Innovations Vertebral Column Cranium

Vertebral Column

Cranium

Vertebrate Phylogeny

Jawless fishes - Living

Hagfish – Myxinoidea 77 Species!

Lamprey - Petromyzoniformes 39 Species

Cyclostomes = Lamprey + Hagfish

Fossil Agnathans - Conodonts Cambrian to End Triassic ~ 500 to 200 Ma Myomeres, notochord, postanal tail, dorsal nerve cord, pharyngeal slits Mineralized dental tissues – cellular bone

Fossil Agnathans - Ostracoderms Ordovician to End Devonian ~ 470 to 370 Ma

Placoderms – True Jaws Appear Silurian to Devonian ~ 440 to 370 MA

Placoderms replaced by sharks?

Chondrichthyes – Elasmobranchii & Holocephali ~ 460 Ma – Silurian ‘Cartilage Fish’

Osteichthyes – ‘Bony Fish’ ~ 460 Ma – Silurian

Actinopterygii the Ray Finned Fishes Bowfin – Amia A primitive Actinopterygiian

Teleostei – over 25,000 living species Perch Skull

Sarcopterygii – Lobe Finned Fish

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