What is a phylogenetic tree?. M. A. Norell et al., Science 317, 1378 -1381 (2007)

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Presentation transcript:

What is a phylogenetic tree?

M. A. Norell et al., Science 317, (2007)

Dunn et al. 2008

Synapsids Ancestral amniote Reptiles Diapsids Archosaurs Saurischians Lepidosaurs Dinosaurs Parareptiles Turtles Crocodilians Pterosaurs Ornithischian dinosaurs Saurischian dinosaurs other than birds Birds Plesiosaurs Ichthyosaurs Tuatara Squamates Mammals Campbell & Reece textbook

Common ancestry models Pedigree –A depiction of the ancestry relations within populations –Net-like (reticulate) Phylogeny –A depiction of the ancestry relations between species –Tree-like (divergent)

Four plants connected to their parents parents offspring

past future

Lineage-branching Speciation What happened here?

Extinction

ABC The True History ABC A simplified representation Representation of phylogenies?

Some terms used to describe a phylogenetic tree Taxon (taxa) TipLeaf Internal branch Node Root

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