Flashcards
Cladistics
Cards in this deck (9)
- 1SymplesiomorphyA primitive character state for the taxa under consideration
- 2SynapomorphyA character which is derived and is used to identify common ancestry
- 3AutopomorphyA unique derived character that is only present in a single lineage
- 4Sister GroupTwo classes resulting from the splitting of a single lineage, defined by synapomorphies
- 5Crown GroupAll taxa descended from a major cladigenesis event: recognised by the clades synapomorphy
- 6Stem GroupAll taxa in a group preceding a major cladogenesis event, may not possess the classes synapomorphy
- 7MonophyleticMade up of ancestral species and all of its descendants. Defined by synapomorphy.
- 8ParaphyleticConsists of an ancestor and some, but not all, of its descendants. Defined by symplesiomorphy.
- 9PolyphyleticLacks the common ancestor of the species in the group. Often result of convergent evolution. Defined by analogy - analogous trait e.g wings