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Phyla Onychophora and Arthropoda

Phyla Onychophora and Arthropoda. Arthropoda. Click on picture to go to phylum. Onychophora. Phylum Onychophora. Phylum Arthropoda. Jointed exoskeleton of chitin Trachea Malpighian tubules Specialization of segments. Systems. Arthropod Systems. Systems continue.

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Phyla Onychophora and Arthropoda

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  1. Phyla Onychophora and Arthropoda Arthropoda Click on picture to go to phylum Onychophora

  2. Phylum Onychophora

  3. Phylum Arthropoda • Jointed exoskeleton of chitin • Trachea • Malpighian tubules • Specialization of segments Systems

  4. Arthropod Systems Systems continue • Integumentary- one cell layer epidermis, secretes exoskeleton of chitin. • Skeletal- jointed exoskeleton of chitin; must be molted for growth, very protective, but not supportative. • Muscle- striated muscle and very complex for moving skeleton; hydrostatic. • Digestive- complex and complete, mouthparts and gut modified for food source.

  5. Arthropod Systems continues Systems continue • Excretory - coxal glands; green glands; Malpighian tubules • Respiratory - book gills, book lungs, tracheae. • Circulatory- open with dorsal heart; circulatory not used to transport oxygen in many species. • Nervous- Dorsal brain; ventral double nerve cord with ganglia each segment; most behavior innate.

  6. Systems continue Arthropod Systems continues • Endocrine- most hormones neural in origin; molting controlled by hormones, ecdysone and juvenile hormone. • Reproductive • Varied, mostly dioecious, usually sexual dimorphism; complex life cycles; usually adult and larva do not compete for food. • Fertilization mostly internal • Development • Direct development • Hemimetabolous (incomplete)metamorphosis • Holometabolous (complete) metamorphosis.

  7. Return to systems Phylum Arthropoda • Subphylum- Trilobita • Subphylum- Chelicerata • Subphylum- Crustacea • Subphylum- Uniramia (not on this power point presentation)

  8. Subphylum Trilobita Return to Subphyla • Extinct

  9. Subphylum Chelicerata (key-lis-er-a-ta) • Class: Merostomata (mer-o-sto-ma-ta) • Limulus (horseshoe crab) • Class: Pycnogonida (pick-no-gon-I-da) • Sea spiders • Class: Arachnida (a-rack-ni-da) • Spiders, tick,mites, scorpions etc. Phylum Arthropoda

  10. Class: Merostomata Return to Chelicerata • Limulus

  11. Class: Pycnogonida Return to Chelicerata • Sea spiders

  12. Class: Arachnida Return to Chelicerata • Order: Araneae (a-ran-e-e) • Latrodectus (black widow spider) • Loxosceles reclusa (fiddle-back spider or brown recluse) • Order:Scorpionida (scorn-p-on-Ida) • Scorpions • Order: Opiliones(o-pil-e-on-i-da) • Harvestmen or daddy longlegs • Order: Acari(ac-kar-i) • Ticks and mites • Order: Pseudoscorpionida • pseudoscorpions

  13. Loxosceles reclusa Latrodectus Return to Arachnida Order Araneae • Spiders

  14. Ventral Order: Scorpionida Return to Arachnida • Scorpions

  15. Order: Opiliones Return to Arachnida • Harvestmen (daddy longlegs)

  16. male female Order: Acari Return to Arachnida • Ticks and mites

  17. Return to Arachnida Order: Pseudoscorpionida About 2,000 species of false scorpions The largest species reaches a length of only 7 mm

  18. Subphylum Crustacea Return to Arthropoda • Class: Maxillopoda (subclass Cirripedia) • barnacles • Class: Malacostraca • Order: Isopoda • pill bugs • Order Amphipoda • Order: Decapoda • Cambarus (Procambarus) - Crayfish • Class: BranchiopodaCrayfish dissection • Tadpole shrimp

  19. Gooseneck barnacles Acorn barnacles Return to Crustacea Class: Maxillopoda • Subclass: Cirripedia • Barnacles

  20. Class: Malacostraca Return to Crustacea • Order Isopoda pill bugs • Order Amphipoda

  21. Class Malacostraca Return to Crustacea Crayfish dissection Order: Decapoda

  22. Crayfish Dissection Return to Decapoda • Sex determination • Crayfish appendages • Mouth parts • All appendages • Crayfish Internal

  23. Female Male Sex determination Crayfish dissection

  24. Crayfish dissection Cambarus dissection internal

  25. Cambarus dissection mouth appendages Crayfish dissection

  26. Cambarus dissection All appendages Crayfish dissection

  27. Return to Crustacea Branchiopoda • Tadpole shrimp

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