Phylum Arthropoda
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Anatomy
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Crustacea
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Circulatory.
Open circulatory system.
Circulates primarily through hemocoel.
Open cavity that surrounds and spaces organs.
Contains a heart.
Digestive.
Complete digestive tract (two openings a mouth and a anus).
Three regions:
Foregut- breaks the food up.
Midgut- does most of the digesting.
Hindgut- reabsorbs water.
Excretory.
Varies depending on environment.
Some release liquid waste in the form of ammonia.
Some release it in the form uric acid.
Some contain malpighian tubules, which filter waste from the blood.
Most contain nephridia, which act as "little kidneys."
Respiratory.
Wide variety of forms.
Smaller arthropods diffuse oxygen directly through skin.
Others may have
:
Gills.
Books lungs.
Tracheae
Nervous.
"Ladder-like" nervous system.
Brain is in the head and located above the esophagus.
Have two main nerve cords, which run the length of the body.
They connect as form of ganglia in each segment (giving a ladder-like appearance).