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Taxonomy(Naming
and Grouping)
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Why is a naming system important?
Have you seen a… • Florida panther?• Cougar?• Mountain lion?• Catamount?• Puma?• They are all the
SAME animal!• Their difference
is their regional “common name”
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The origins of taxonomy• Taxonomy → grouping and naming of
organisms– to understand the variety of life– to avoid confusion of regional names
• Carl (Carolus) Linnaeus (1707-1778)– developed a binomial nomenclature (2-part
name), now called the scientific name– developed a 7-level (taxon) classification
• (domain), kingdom, phylum, class, order, family, genus, species– Dreaded King Philip Came Over For Great Spaghetti– Did King Philip Come Over From Glorious Spain?– Dumb Kids Playing Chicken On Freeways Go Splat
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The Three Domains(added in 1990)
(…eukaryotes)
(…”common” prokaryotes)
(…“ancient” prokaryotes)
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The scientific name is taken from the genus and species
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Taxonomic groups• Beginning with domain, each successive
level of classification becomes more specific
Members of a genus share more in common than members of a
family
• Organisms within the same group have more in common with one another than those within the next largest group
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Kingdoms and Domains
Bacteria EukaryaArchaea
Archaea Bacteria Protista Plantae Fungi Animalia
The Three Domains
The Six Kingdoms
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What is a Cladogram?• Cladogram →
diagram that shows evolutionary relationships between organisms
• Helps scientists understand how one lineage broke away from another in the course of evolution
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What is a Dichotomous Key?
• Dichotomous key → classification used to identify unknown organisms
• Based on visible similarities
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