Lecture_11_26_Chordata_1

Lecture_11_26_Chordata_1 - Deuterostomes II: Chordata...

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Deuterostomes II: Chordata (Includes non-vertebrate chordates, jawless fishes, jawed fishes, and tetrapods)
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Four major features of Chordata notochord dorsal hollow nerve pharyngeal slits post-anal tail
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Four major features of Chordata notochord dorsal hollow nerve pharyngeal slits post-anal tail Three are good synapomorphies for Chordates
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Early chordate evolution Major chordate features are present in larvae , but not always in adults, of the non-vertebrate chordates. Note: Urochordates = ascidians = sea squirts = tunicates (also a few other minor groups) Cephalochordates = lancelets
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Urochordata: tunicates
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Urochordates show all chordate characters in the larva 1. Notochord 2. Dorsal hollow nerve 3. Pharyngeal slits 4. Post-anal tail
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Urochordates very young larva Mature adult
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Cephalochordata:lancelets Chordate features present in adults notochord dorsal hollow nerve many pharyngeal slits post-anal tail
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Cephalochordata tail cross-section dorsal hollow nerve notochord
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Lecture_11_26_Chordata_1 - Deuterostomes II: Chordata...

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