Phylogenetics and classification. Taxonomy: the classification of living organisms. Historically, classification was hierarchical. Phylogeny: Classification using evolutionary relationships. Species. Order. Family. Genus.
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GenusRecall: Evolutionary relationships are depicted in phylogenetic trees
phylogeny indicates two bilaterian clades: deuterostomes and protostomes
bilaterian clades: Deuterostomia,
Lophotrochozoa , Ecdysozoa
**Based on nucleotide sequences of small subunit ribosomal RNA
Trees are hypotheses (best guess given the current information)But hypothesis can be repeatedly tested and the best ones have support from multiple lines of evidence
What is a species?
How do species come about?