2. Diversification
Diversification of Land Plants (450-350 Ma)
Lecture Resources
Session 2 Notes
Narrative
First Wetlands (425-390 mya)
Geologic Periods
Devonian Period (419-359 Ma)
Silurian Period (444-419 Ma)
Events of Note
Origin of branching
Origin of true vascular tissue
Strange organisms that were evolutionary "experiments"
First simple leaves (microphylls)
Origin and diversification of Lycophytes
Origin of Euphyllophytes
Origin of land invertebrates
Plant groups covered in class
Bryophytes (mosses, liverworts)
Aglaophyton † (early branching plants)
Rhynia † (Rhyniophytes)
Sawdonia † (Zosterophylls)
Clubmosses or Lycopods
Asteroxylon † (Drepanophytes)
Psilophyton † (Trimerophytes)
Extended Learning - Groups Not Covered in Class
Horneophyton (earliest branching plants)
Cooksonioids † (earliest true vascular plants)
Nematophytes † (strange plant-like, fungus-like organisms of unknown origin)
Protolepidodendales † (early scale trees)
Lycopodiales (true clubmosses)