Mesozoic Seas

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Mesozoic Seas
2014-05-22 23:39:50

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  1. end Permian mass extinction
    • 90%-96% of all marine species
    • 70% terrestrial families (tetrapods and insects)
    • transition to modern fauna
  2. tetrapods
    • amphibians, reptiles, birds, and mammals
    • known from the late Devonian
    • 1st terrestrial vertebrates
  3. arguments for ectothermy in Dinosaurs
    • lack of nasal turbinates (nasal bones covered in vascular tissues): All homeotherms have turbinates.
    • oxy16-18 contaminated by ground water
    • bone growth rates: Some dinosaurs have lamellarzonal laminae, as seen in ectotherms
    • high latitudes: (seasonal migration)
    • scaley: Ectotherms are generally scaley, but so are birds: Feathers are modified scales.
    • Dinosaurs were quite large: Large endotherms such as land mammals and whales have problems with heat.
  4. first vertebrates capable of active flight
  5. Pterosaurs evolved from
    • a small bipedal archosaur (Late Triassic)
    • got quite large
  6. Pterosaurs went extinct in the __ period.
  7. diet of Pterosaurs
    piscivorous (fish eaters)
  8. ammonites: phylum and class
    Mollusca; Cephalopoda
  9. Ammonites became extinct in the __ period
    late Cretaceous
  10. Ray finned fish diversified in the __ period with major radiation in the __
    early Triassic; Tertiary
  11. Mesozoic marine revolution
    • restructuring of marine benthic communities from the Permian with major diversification of predator-prey relations
    • Decapods (crabs) evolved specialized claws and gastropods evolved ornamented shells.. "Mesozoic arms race"
    • reef builders: Sceractinian corals (late Trias-Rec)
    • loss of crinoids and brachiopods (the Paleozoic fauna)
    • Bivalves diversified
  12. Mesozoic marine animals
    • ammonites
    • ray finned fish
    • decapods with specialized claws
    • bivalves
    • reef builders
  13. Mesozoic marien reptiles
    • sea turtles
    • crocodilians (model for dinosaurs)
    • ichthyosaurs (live birth)
    • plesiosaurs (largest predators)
    • mosasarus (good swimmers; ate fish)
  14. Mesozoic plants
    • angiosperms: flowering plants
    • evolved in the late Cretaceous
    • (dominate plants of the Cenozoic)
    • huge influence on ecology of browsers and grazers