Review_eemb3_lecture8 [Compatibility Mode].pdf

3 chordate diversity cephalochordate vertebrates on

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3 Chordate Diversity Cephalochordate Vertebrates On Friday Tunicate The Cephalochordates Lancelets Common in shallow sandy bays Small animals, 2-5 cm Persistent notochord in adult Usually partially buried in sand Large sac-like pharynx with gill slits for food collection and respiration The Urochordates Three groups Tunicates, mostly sea squirts (aka ascidians – Thaliaceans – Larvaceans Tunicates: Adults are highly modified, sessile animals Larvae settle Nerve cord and notochord disappear “Sea squirts” Sea squirt Ciona intestinalis
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4 Vertebrates The Vertebrate Ancestor: An estuarine species… Origin of the Vertebrates Notochord replacement: A new dorsal supporting structures evolves: vertebral column What was the ancestral vertebrate like? Hints:the jawless fishes: – Hagfishes – Lampreys Mud-sucking eel-like animal, without a jaw Pacific hagfish Courtesy of Monterey Bay Aquarium
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5 Vertebrates on Friday Evolution of the jaw & other features of the vertebrates…
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  • Summer '14
  • nerve cord, Notochord, Phylum Chordata, persistent notochord, principle chordate clades

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