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Bis2CF10.Lecture20 - Lecture 20 INTRODUCTION TO ANGIOSPERMS...

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Lecture 20 INTRODUCTION TO ANGIOSPERMS Last: evolution and diversity of gymnosperms Basic features, synapomorphies of angiosperms (see Chapters 34 & 38 for details) Possible angiosperm outgroups Rooting the angiosperm tree Next: evolution and diversity within angiosperms
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ANGIOSPERMS = FLOWERING PLANTS Drimys Cactaceae Lemna (duckweed)
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Oldest fossil angiosperms Early Cretaceous, 135 MY First seed plants (seed ferns) Late Devonian, 365 MY First land plant spores Middle Ordovician, 470 MY Angiosperms abundant: 100 MY
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Angiosperms abundant: 100 MY Jurassic landscape Oldest fossil angiosperms Early Cretaceous, 135 MY
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Cretaceous leaf & pollen sequence (Potomac Formation, Maryland & Virginia) Albian Aptian LATE CRETACEOUS EARLY CRETACEOUS Cenomanian STAGES Barremian 98 MY Archaefructus NE China monosulcate tricolpate 125 MY
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ANGIOSPERMS OUTGROUPS Reconstructing precursors of angiosperm structures SISTER GROUP Reconstructing most recent common ancestor
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Secondary growth = Heterospory Net-veined leaves 2+2 microsporangia Carpel: ovules enclosed Two integuments
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