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The Animal Kingdom
Objective 5.3
Symmetry Review
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There are 3 types of symmetry
Bilateral- body parts can be split into two
equal halves
Radial- body parts arranged in a circle
Asymmetrical- body parts in no definite
shape
Vertebrates
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Animals with a
backbone
Endothermic vs. Ectothermic
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Endotherms are
animals who control
their own internal body
temperature
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Ectotherms are animals
whose body does not
produce much internal
heat
Invertebrates
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Animals without a backbone
97% of animals are invertebrates
Many different types of invertebrates:
Sponges, Cnidarians, Worms, Echinoderms,
Mollusks, Arthropods.
Sponges
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Habitat- mostly oceans
Like plants because they are sessile, but
unlike plants because they do not make their
own food
They are asymmetrical
Reproduce both sexually and asexually
Budding is one form of asexual reproduction
Cnidarians
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Invertebrates with stinging cells which are
used to capture prey
Cnidarians reproduce both sexually and
asexually. Budding is the most important
form.
Worms
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There are round, flat,
and segmented worms.
Worms reproduce
sexually and asexually
Some worms are
hermaphroditic and
some worms can
regenerate.
Echinoderms
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Have a water vascular
system
Move with tube feet
Reproduce by external
fertilization
Mollusks
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Have a soft body
covered by a shell
Most have an open
circulatory system
Most mollusks that live
in the water use gills
Arthropods
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Have exoskeleton, segmented bodies, and
jointed appendages
Arthro- means joint and podos- means leg in
Greek
Examples include crustaceans, arachnids,
centipedes, and insects
Insects
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Insects have 3 body parts, six legs, one pair
of antennae, and usually wings.
Insects either undergo complete or
incomplete metamorphosis
Complete Metamorphosis
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Egg
Larva
Pupa
Adult
Incomplete metamorphosis
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•
Egg
Nymph
Larger
Nymph
Adult