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Definition
63,000 species
Induces scientific curiosity (diverse forms, adaptations, and behaviors)
Has economic importance
Plays in many ecological roles |
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Definition
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Subphylum Vertebrata Characteristics
(2) |
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Definition
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Hagfish Classification
(2) |
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Definition
Has no cranium
Still considered true vertebrate |
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Term
| 5 Chordata Characteristics and Functions |
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Definition
Post anal tail (locomotion)
Notochord (support)
Dorsal nerve cord (movement, coordination)
Pharyngeal slits (respiration, feeding)
Endostyle (produces mucus to trap food in pharynx) |
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Definition
| Become thyroid in later vertabrates |
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Definition
| Study of evolutionary relationships among organisms |
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Term
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Definition
Evolutionary Systematics (traditional)
Cladistics |
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Term
Evolutionary Systematics (traditional)
(2) |
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Definition
Subjective assessment of character traits that places "similar" organisms together
No longer used |
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Definition
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Definition
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Definition
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Term
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Definition
| Determines groups of organisms based on evolutionary history regardless of their overall similarity or difference |
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Term
Objective of Cladistics
(2) |
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Definition
To create monophyletic groups (ancestor and all its descendants)
Creates group based on shared derived characters, NOT ancestral |
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Term
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Definition
Newly evolved from previous state
Absence of a character trait cannot determine a group |
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Term
Evolutionary Tree:
1 Frog and 2 Mammals
Compare Characteristics to a Fish
(5) |
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Definition
Fish (outgroup): ancestral state
All 4 have vertebrate: ancestral character
Frogs and mammals have 4 limbs w/ digits: derived character
Only mammals have hair: derived character
Only one mammal has hooves: derived character |
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Term
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Definition
Revolutionized classification of vertebrates
Doesn't use taxonomic group names
Groups organisms differently because of monophyletic groups |
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