Arthropod Notes - Lake Stevens High School / Overview
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Transcript Arthropod Notes - Lake Stevens High School / Overview
Arthropod Notes
Arthropod Characteristics
“anthron”
= joint
“podos” = foot
segmented body
tough exoskeleton
jointed appendages.
Growth
Exoskeleton – suit of
armor that protects
and supports the body.
Molting:
Skin glands digest inner part of exoskeleton. Other
glands make a new skeleton
Animal sheds old exoskeleton.
While the new exoskeleton is soft, the animal fills
with air or fluid to allow room for growth before
skeleton hardens.
Life Functions
Respiration
Feather-like gills
Circulation
Open circulatory system
Response
Brain/sophisticated sense
organs
Movement
Muscles
1. Crustaceans
Examples: shrimp, crabs
and lobsters. 150,000
species.
2 pairs of branched
antennae
2 or 3 body sections
Chewing mouthparts.
Dominate group of
arthropods in the ocean.
Coconut crab
2. Horseshoe
Crabs
living fossil
Blue blood because
it has copper in it.
200 flattened gills
(book gills)
The medical profession uses an extract from the
horseshoe crab's blue, copper-based blood
called lysate to test the purity of medicines
the tail is used to plow the crab through the sand,
to act as a rudder, and to right the crab when it
accidentally tips over.
Female lays 20,000 eggs in the sand and the
male fertilizes them.
3. Sea Spiders
Spiders – feed on sea anemones
Most are tiny and
crawl on sessile
plants and
animals.
Sea
4. Insects
dominate
group of arthropods on land