ANIMAL KINGDOM CLASSIFICATION
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ANIMAL KINGDOM CLASSIFICATION
Animals can be grouped into two large categories:Vertebrates and Invertebrates.
Vertebrates have backbones and invertebrates DO NOT.
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95% of all animals are invertebrates!
The major phyla of invertebrates are: Phylum Porifera Phylum Cnidaria Phylum Platyhelminthes Phylum Nematoda Phylum Mollusca Phylum Annelida Phylum Arthropoda Phylum Echinodermata
Invertebrates
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These are the simplest invertebrates. All sponges are asymmetric They have no tissues, organs or organ
systems. They just have specialized cells. They all live in water.
Porifera
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Cnidarians do not have organs or organ systems.
They have radial symmetry. They have a single body opening surrounded
by tentacles. They have simple tissue to carry out body
functions. They have specialized cells to capture food.
Cnidarians
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Radial symmetry Hard plates embedded in the skin Live only in oceans Complete digestive systems Tube feet Include sea stars, sea cucumbers and sea
urchins
Echinoderms
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They have bilateral symmetry They have nerve, muscle and digestive
tissues They have a simple brain They have soft, flattened bodies Have a mouth Most are parasites.
Platyhelminthes
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Roundworms Bilateral symmetry Nerve muscle and digestive tissues Simple brain Round bodies with mouth and anus
Nematoda
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Bilateral symmetry Soft bodies Some have hard shells Digestive system with two openings Body cavity with heart, stomach and other
organs. Eyes and a simple brain Must remain wet
Mollusks
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Bilateral symmetry Soft bodies Circulatory system Simple brains Includes earthworms, leeches, etc.
Annelids
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Arthropods
Includes insects, spiders, shrimp, crab and relatives
Insects, arachnids and crustaceans Bilateral symmetry Exoskeletons Jointed appendages