1. Arthropod phylogeny & Insect Evolution

2. Objectives: Identify characteristics of the Arthropoda Discuss Arthropod Phylogeny Characteristics of major taxa Discuss Insect Evolution

3. Arthropoda Arthro- Refers to Joints Poda- Refers to feet

4. Arthropoda Characteristics Paired, jointed appendages Segmented body plan Land forms have tracheae or book lungs, Aquatic forms have gills

5. Arthropoda Characteristics Compound eyes Open circulatory system Digestive system is a tube Nervous system with brain, paired ventral nerve cords

6. Arthropoda Exoskeleton is molted

7. Arthropoda

8. Evolved from Annelida

9. Ecdysozoans

10. Arthropoda Phylogeny Many hypotheses exist Molecular data suggest:

11. Arthropoda Classification Chelicerata Mandibulata Hexapoda = antennae

12. Chelicerae = feeding appendages Arthropoda Classification = fangs in spiders

13. Arthropoda Classification 1. Chelicerata Classes: Merostomata - horseshoe crabs Arachnida - spiders, scorpions, ticks, mites

14. Arthropoda Classification Chelicerata Mainly terrestrial Body Divisions - Cephalothorax, abdomen No antennae No chewing mandibles

15. 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

16. 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

17. - biramous appendages

18. Arthropoda Classification Crustacea Mandibles and maxillae used for feeding Chelipeds on lobsters and crayfish - pinching claws Larval stage Green glands

19. Arthropoda Classification Hexapoda Class: Insecta - insects

20. Arthropoda Classification Insecta characteristics Terrestrial and some aquatic Body plan - Head, thorax, abdomen Uniramous 1 pair antennae 3 pairs legs on thorax Malpighian tubules

21. 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

26. Orders: Ephemeroptera = ?

27. Odonata = ?

28. Plecoptera

29. Megaloptera

30. Coleoptera

31. Lepidoptera

32. Diptera