I. Systematics

A. Taxonomy B. Linking Taxonomy and Phylogeny

Systematics

Study of diversity and evolutionary relationships (DNA, traits, homology)

Taxonomy

Describing, Naming, and Classifying

Phylogeny

- Includes the Evolutionary History

• System for naming and grouping species

• Based on Linnean System

• Uses Binomial Nomenclature 

• Each species is assigned a unique two part name (hence binomial)

  • Genus and Species

Nested Hierarchy

Domain -> Species (larger to smaller)

Taxon

• General name for a group at any level

  • Domain

  • Kingdom

  • Phylum

  • Family

  • Genus 

  • Species   

Phylogeny

groups common ancestor with all descendant s

Phylogenetic Species Concept

Smallest set of organisms can be distinguished on a phylogenetic tree (can go back to bacteria)

Cladistics

A method of systematics- based on evolutionary relationships (phylogenetics)

Each group (clade) is nested in larger groups (nested hierarchy)