animals - invertebrateswebsites.rcc.edu/thaler/files/2016/11/chapter23.pdf · echinodermata --...
TRANSCRIPT
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Animals - Invertebrates
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Learning Outcomes
Describe defining characteristics of animals.
Describe defining characteristics of each phylum.
Name/Recognize common examples of each phylum.
Explain the tube-within-a-tube body plan.
Describe differences between tissues, organs, and organ systems.
Explain trends in bilateral symmetry and cephalization.
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Animals
multicellular heterotrophs (obtain energy and organic molecules by eating other organisms) do not have cell walls
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Proifera -- the sponges
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Proifera -- the sponges
no symmetry two cell layers, no tissues choanocytes
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Cnidarians - anenomes and jellyfish
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Cnidarians - anenomes and jellyfish
radial symmetry two tissue layers gastrovascular cavity (GVC) cnidocytes (stinging cells) hydrostatic skeleton nerve net
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Platyhelminthes -- flatworms
some species are parasites
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Platyhelminthes -- flatworms
bilateral symmetry three tissue layers organs cephalization
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Tube within a tube body plan & tissues layers
https://youtu.be/Lgb4wMsZwZA
ectoderm
endoderm
mesoderm
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Annelida - segmented worms
body composed of repeating segments
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Annelida - segmented worms
bilateral symmetry three tissue layers organ systems cephalization metamerism -repeating body segments
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Mollusca -- snails, clams, squid
mantle (pink)
mantle tissue that produces shell > 100,000 living species
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Mollusca -- snails, clams, squid
bilateral symmetry three tissue layers organ systems cephalization mantle - forms/produces shell large muscular foot for locomotion
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Nematoda -- roundworms
bilateral symmetry three tissue layers organ systems cephalization chitin containing cuticle longitunidal muscles only
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Arthropoda - segments & jointed limbs
segmented body jointed appendages exoskeleton containing chitin
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Arthropoda - segments & jointed limbs
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Arthropoda - segments & jointed limbs
bilateral symmetry three tissue layers organ systems segmented body jointed appendages exoskeleton containing chitin
most species of any animal phylum 1 million known species of insects current estimates - 20 million insect species extant
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Echinodermata -- seastars & relatives
water vascular system, exclusively marine
bilateral symmetry three tissue layers organ systems pentaradial symmetry in adults water vascular system and tube feet
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Echinodermata -- seastars & relatives