Animals - Deuterostomes
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Transcript of Animals - Deuterostomes
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Animals - Deuterostomes
Chapter 30
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Characteristics
Similarities in embryonic development:
Radial cleavage Indeterminate cleavage Blastopore becomes the anus Pharyngeal slits
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Echinoderms: Spiny-skinned animals
Sea lilies, feather stars, sea stars, brittle stars, sea urchins, sand dollars, sea cucumbers, sea daisies
Endoskeleton covered by a thin epidermis
Water vascular system Radial symmetry All are marine
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Chordates
Tunicates, Lancelets, and vertebrates
Four characteristics:1. Notochord2. Dorsal tubular nerve cord3. Pharyngeal slits4. Postanal tail
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Agnatha – lampreys & hagfish
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Cartilagenous fish – Sharks, skates, & rays
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Bony Fish – most fish are in this group
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Frogs – have smoother skin than Toads
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Salamanders & Newts
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Caecilian
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Modern Reptiles
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Birds
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Along came mammals: Monotremes lay eggs
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Marsupials: Pouched Mammals
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Placental Mammals