7th grade ch. 2 sec. 2 arthropods
TRANSCRIPT
Ch. 2 Sec. 2
Arthropods
Characteristicsof
Arthropods
invertebrateexoskeleton
• external skeleton
segmented body
jointed appendages
antenna= contains
sense organs
•protects•preventsevaporation
moltingmolting• process of shedding outgrown exoskeleton
Yikes! My Skeleton is Outside My Body!
soft shelled crab
(crab, shrimp) (spider, tick) (bee, fly)
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.
- Arthropods
• .
A crustacean is an arthropod that has two or three body sections, five or more pairs of legs, & two pairs of antennae
arachnids
abdomen
combined head & body section
Red Knee Tarantula
examples of arachnids:
scorpionsdust mites
deer ticks
spiders• predators
• have hollow fangs-
1. inject venom into prey
2. turns tissues into mush3. uses fangs like straws to suck out mush
The Dangerous Brown Recluse Spider
This guy was bitten by a Brown Recluse spider.
Day 3
The following illustrates the progression of a brown recluse spider bite.
The affected skin actually dies on his body.
Day 5
Black widow spider
centipedes millipedes
1 pair of legs on each segment
2 pairs of legs on each segment
carnivores herbivores
More arthropod groups
centipede
• Millipedes in the Great Smoky
Mountains National Park in
Tennessee
When millipedes are disturbed, they can curl up into an armored ball and squirt an awful-smelling
liquid at a potential predator.
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.