7th grade ch. 2 sec. 2 arthropods
TRANSCRIPT
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Ch. 2 Sec. 2
Arthropods
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Characteristicsof
Arthropods
invertebrateexoskeleton
• external skeleton
segmented body
jointed appendages
antenna= contains
sense organs
•protects•preventsevaporation
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moltingmolting• process of shedding outgrown exoskeleton
Yikes! My Skeleton is Outside My Body!
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soft shelled crab
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(crab, shrimp) (spider, tick) (bee, fly)
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metamorphosis• process in which an animal’s body
undergoes dramatic changes in form during its life cycle
Crab Larva This larva of a crab floats in the ocean with other microscopic animals.
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- Arthropods
• .
A crustacean is an arthropod that has two or three body sections, five or more pairs of legs, & two pairs of antennae
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arachnids
abdomen
combined head & body section
Red Knee Tarantula
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examples of arachnids:
scorpionsdust mites
deer ticks
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spiders• predators
• have hollow fangs-
1. inject venom into prey
2. turns tissues into mush3. uses fangs like straws to suck out mush
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The Dangerous Brown Recluse Spider
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This guy was bitten by a Brown Recluse spider.
Day 3
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The following illustrates the progression of a brown recluse spider bite.
The affected skin actually dies on his body.
Day 5
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Black widow spider
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centipedes millipedes
1 pair of legs on each segment
2 pairs of legs on each segment
carnivores herbivores
More arthropod groups
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centipede
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• Millipedes in the Great Smoky
Mountains National Park in
Tennessee
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When millipedes are disturbed, they can curl up into an armored ball and squirt an awful-smelling
liquid at a potential predator.
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Arthropods
Crustaceans
include
have have have have
ArachnidsCentipedes
and millipedes
6 legs, 3 body sections
Four antennae
Insects
Eight legs, two body segments,
no antennae
Highly segmented body,1 or 2 pairs of legson each segment, 2
antennae
1. 2.
3. 4.