Download Insect Relatives

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Insect Relatives
= Arthropods
= arthron - joint, podos - foot
The Chelicerata - Arachnida, Merostomata
The Uniramia 1
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Arthropod Evolution: Characteristic Features
1.  Exoskelton
chitinous cuticle
2. Appendages paired, jointed
3. Segmented body
Tagmata
4. Head structures
Arthropod Evolution: Occurrence
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Arthropod Evolution: Constraints
Exoskeleton= moulting hazardous when
large, not strong enough to support
large animals, oxygen constraints
Arthropod Relationships
Hexapoda
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Sex, Violence and a Cast of Millions
- amount of
knowledge
increases = 1/2
million articles in
10 years
- huge popularity:
Lab animals
Genetics
Population study
Complex behaviors
- 29 living orders
- between 1-2
million species Insect Evolution
Mantodea
Lepidoptera Hymenoptera, Diptera
Odonata, Hemiptera
Orthoptera
First primitive insects
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Insect Significance
2 significant groups of organisms on land:
56.3% Insects = about 3/4 of all animals
4.5% arachnids
1.2% other arthropods
0.9% nematoda
2.7% vertebrates
2.4% crustacea
4.2% molluscs
4.0% other inverts
14.3% plants
4.2% fungi
2.4% protozoa
2.4% algae
0.5% bacteria, viruses
Characteristics
Arthropods: exosceleton, jointed limbs, tagmatization
3 tagmata, six legs, 2 pairs of wings, small, distinct colors
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Five factors
for a winning
formula
1. Small size
2. Protective cuticle
3. Efficient nervous system
4. Evolution of flight
5. High reproductive rate
Plentiful, Numerous, Interesting
Build highrises
Breather underwater
Create explosions
Make paper
Farm animals
Take slaves
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