classification ch 18blogs.4j.lane.edu/sanderson/files/2018/01/02_classification.pdf · 02-01-2018...
TRANSCRIPT
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Classification Ch 18
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Finding Order in Diversity• Why classify?
• common names• bull snake, gopher snake
• Binomial nomenclature• Carolus Linnaeus (17th C.)
• plants, animals• K,P,C,O,F,G,s
• Traditional: general sim.• Now: evolutionary classification
EQ1: Why do we classify organisms? EQ2: What criteria separate taxa?
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Modern System
• Domain• Kingdom
• Phylum• Class
• Order• Family
• Genus• species
• evolutionary classification• Based on how long a species has been evolving
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Scientific name examples• Canis lupus • Canis lupus domesticus • Agaporomorphous colberti • Synalpheus pinkfloydi • Vampyroteuthis infernalis
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Dichotomous Key
• Bird W: _________________________• Bird X: _________________________• Bird Y: _________________________• Bird Z: _________________________
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Problems with Linnean System
• Physical features sometimes deceptive
• barnacle, limpet
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Tim
e
Now
Cladograms• Clade = a group consisting of a species (extinct or extant) and
all of its descendants
• Cladogram• axes: time & diversity• shows shared characteristics• shows relative order of evolved traits• shows evolutionary relationships
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(p. 802 & 803 in text)
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ANIMALS TO CLASSIFY