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Arthropod classification
- 2. SUBPHYLUM TRILOBITOMORPHA • Trilobites • Diverse group of marine invertebrates who lived during the 500 -250 million years ago. • Well preserved fossil record. (Why?) • Ancestor to modern arthropods
- 3. SUBPHYLUM CHELICERATA • Class Merostomata – Horseshoe Crabs • Class Arachnida – Spiders, Scorpions, Ticks • Class Pycnogonida – Sea Spiders
- 4. SUBPHYLUM CHELICERATA • No antenna • Two body segments (cephalothorax, abdomen) • First pair of appendages (chelicera) adapted for feeding • Second pair of appendages (pedipalps) to hold prey • Book lungs/book gills for respiration • Four pairs of walking legs
- 5. SUBPHYLUM MANDIBULATA • Class Myriapoda • Order Chilopoda (Centipedes) • Order Diplopoda (Millipedes) • Class Insecta • Subclass Apterygota (Wingless Insects) • Subclass Pterygota (Winged Insects) • Class Crustacea • Subclass Malacostraca (Crabs, Lobsters, Shrimp, Woodbugs) • Subclass Cirripedia (Barnacles) • Subclasses Ostracoda, Copepod (Planktonic Crustaceans)
- 6. SUBPHYLUM MANDIBULATA • Head appendages are modified as mandibles for chewing or grinding. • Class Myriapoda • Order Chilopoda (Centipedes) • One pair of walking legs per segment • Flat body, fast moving • Some poisonous • Carnivores • Order Diplopoda (Millipedes) • Two pairs of walking legs per segment • Round body, slow movers • Herbivores
- 7. SUBPHYLUM MANDIBULATA • Class Insecta • Three pairs of walking legs (uniramous)on thorax • One pair or antenna • Three body segments • May have wings (only flying invertebrates)
- 11. MOSQUITO
- 18. SUBPHYLUM MANDIBULATA • Class Myriapoda • Order Chilopoda (Centipedes) • Order Diplopoda (Millipedes) • Class Insecta • Subclass Apterygota (Wingless Insects) • Subclass Pterygota (Winged Insects) • Class Crustacea • Subclass Malacostraca (Crabs, Lobsters, Shrimp, Woodbugs) • Subclass Cirripedia (Barnacles) • Subclasses Ostracoda, Copepod (Planktonic Crustaceans)
- 19. SUBPHYLUM MANDIBULATA • Class Crustacea • Two or three body segments • 4-5 pairs of walking legs • 2 pairs of antenna
- 20. BARNACLES