Arthropod phylogeny & Insect Evolution

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Arthropod phylogeny & Insect Evolution. Objectives:. Identify characteristics of the Arthropoda Discuss Arthropod Phylogeny Characteristics of major taxa Discuss Insect Evolution. Arthropoda. Arthro- Refers to Joints Poda- Refers to feet. Arthropoda. Characteristics - PowerPoint PPT Presentation

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Arthropod phylogeny&Insect Evolution

1Objectives:Identify characteristics of the Arthropoda

Discuss Arthropod Phylogeny

Characteristics of major taxa

Discuss Insect Evolution

2ArthropodaArthro- Refers to Joints

Poda- Refers to feet

3ArthropodaCharacteristicsPaired, jointed appendagesSegmented body planLand forms have tracheae or book lungs, Aquatic forms have gills

4ArthropodaCharacteristicsCompound eyesOpen circulatory systemDigestive system is a tubeNervous system with brain, paired ventral nerve cords

5ArthropodaExoskeleton is molted

6 Arthropoda

7ArthropodaEvolved from Annelida

8Ecdysozoans

9Arthropoda PhylogenyMany hypotheses exist

Molecular data suggest:

10Arthropoda ClassificationChelicerataMandibulata

Hexapoda = antennae11Chelicerae = feeding appendages

Arthropoda Classification

= fangs in spiders12Arthropoda Classification1. ChelicerataClasses:Merostomata - horseshoe crabsArachnida - spiders, scorpions, ticks, mites

13Arthropoda ClassificationChelicerataMainly terrestrialBody Divisions - Cephalothorax, abdomenNo antennaeNo chewing mandibles

14Arthropoda ClassificationChelicerataFirst and second pair of appendages - chelicerae, pedipalps used for manipulation of food, locomotion, defense, copulationNext four pair of appendages - walking

15Arthropoda ClassificationCrustaceaAquaticBody divisions - cephalothorax and abdomenGills 2 pairs antennae - touch and tasteBiramous appendages - two jointed branches arising from their base

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- biramous appendages17Arthropoda ClassificationCrustaceaMandibles and maxillae used for feedingChelipeds on lobsters and crayfish - pinching clawsLarval stageGreen glands

18Arthropoda ClassificationHexapodaClass:Insecta - insects

19Arthropoda ClassificationInsecta characteristicsTerrestrial and some aquaticBody plan - Head, thorax, abdomenUniramous1 pair antennae3 pairs legs on thoraxMalpighian tubules

20Insect EvolutionFour stages of insect evolution:Development of insect body form

Development of wings

Development of wing flexion

Development of complete metamorphosis

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25Orders:

Ephemeroptera = ?

Odonata = ?

Plecoptera

Megaloptera

Coleoptera

Lepidoptera

Diptera

Hemiptera