Animals - Invertebrates
Animals - Invertebrates
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.
Animals
multicellular heterotrophs (obtain energy and organic molecules by eating other organisms) do not have cell walls
Proifera -- the sponges
Proifera -- the sponges
no symmetry two cell layers, no tissues choanocytes
Cnidarians - anenomes and jellyfish
Cnidarians - anenomes and jellyfish
radial symmetry two tissue layers gastrovascular cavity (GVC) cnidocytes (stinging cells) hydrostatic skeleton nerve net
Platyhelminthes -- flatworms
some species are parasites
Platyhelminthes -- flatworms
bilateral symmetry three tissue layers organs cephalization
Tube within a tube body plan & tissues layers
https://youtu.be/Lgb4wMsZwZA
ectoderm
endoderm
mesoderm
Annelida - segmented worms
body composed of repeating segments
Annelida - segmented worms
bilateral symmetry three tissue layers organ systems cephalization metamerism -repeating body segments
Mollusca -- snails, clams, squid
mantle (pink)
mantle tissue that produces shell > 100,000 living species
Mollusca -- snails, clams, squid
bilateral symmetry three tissue layers organ systems cephalization mantle - forms/produces shell large muscular foot for locomotion
Nematoda -- roundworms
bilateral symmetry three tissue layers organ systems cephalization chitin containing cuticle longitunidal muscles only
Arthropoda - segments & jointed limbs
segmented body jointed appendages exoskeleton containing chitin
Arthropoda - segments & jointed limbs
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
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
Echinodermata -- seastars & relatives