Arthropod phylogeny & Insect Evolution. Objectives: Identify characteristics of the Arthropoda...
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Transcript of Arthropod phylogeny & Insect Evolution. Objectives: Identify characteristics of the Arthropoda...
Objectives:
Identify characteristics of the Arthropoda
Discuss Arthropod Phylogeny
Characteristics of major taxa
Discuss Insect Evolution
Arthropoda
Characteristics• Paired, jointed appendages• Segmented body plan• Land forms have tracheae
or book lungs, • Aquatic forms have gills
Arthropoda
Characteristics• Compound eyes• Open circulatory system• Digestive system is a tube• Nervous system with brain,
paired ventral nerve cords
Arthropoda Classification
1. Chelicerata
Classes:
Merostomata - horseshoe crabs
Arachnida - spiders, scorpions, ticks, mites
Arthropoda Classification
Chelicerata• Mainly terrestrial• Body Divisions - Cephalothorax, abdomen• No antennae• No chewing mandibles
Arthropoda Classification
Chelicerata• First and second pair of appendages -
chelicerae, pedipalps used for manipulation of food, locomotion, defense, copulation
• Next four pair of appendages - walking
Arthropoda Classification
Crustacea• Aquatic• Body divisions - cephalothorax and abdomen• Gills • 2 pairs antennae - touch and taste• Biramous appendages - two jointed branches
arising from their base
Arthropoda Classification
Crustacea• Mandibles and maxillae used for feeding• Chelipeds on lobsters and crayfish - pinching
claws• Larval stage• Green glands
Arthropoda Classification
Insecta characteristics
Terrestrial and some aquatic
Body plan - Head, thorax, abdomen
Uniramous
1 pair antennae
3 pairs legs on thorax
Malpighian tubules
Insect Evolution
• Four stages of insect evolution:1. Development of insect body form
2. Development of wings
3. Development of wing flexion
4. Development of complete metamorphosis