major animal groups and evolutionary innovations · 2016. 7. 19. · metazoa: true animals phylum...
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Major animal groupsand evolutionaryinnovations
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Protistseukaryotes; unicellular
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Poriferasponges; colonial rather than truly multicellular
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Metazoa: true animals Phylum Cnidaria
corals, jellyfish, anemonetruly multicellular (2 embryonic cell layers)
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Coral anatomy
• symbionts)
Zooxanthellae essential to reef ecosystem (photosynthetic symbiotic algae in coral polyps)
Bleached corals due to expulsion of algae
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Triploblastic: 3 embryonic cell layers
• Platyhelminthes: bilateral symmetry
cephalization
centralization
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3 embryonic layers 3 embryonic layers No coelom coelom
Flow through digestive tract
Regional specialization
Segmentation
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Protostome: Phylum Annelida
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Protostome: Phylum Mollusca
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Protostome: Phylum Arthropoda
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Deuterostome: Phylum Echinodermata
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Deuterostome: Phylum Chordata
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Tunicates (invertebrate chordates)
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Subphylum Vertebrata: class chondrichthyes
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Subphylum Vertebrata:class Osteichthyes
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Subphylum Vertebrata: class amphibia
anurans
urodeles
caecilians
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Subphylum Vertebrata:class reptiliaamniotic egg
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Subphylum Vertebrata:class aves
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Subphylum Vertebrata:class mammalia
monotreme marsupial
placental