Phylum Arthropoda (Sept. 3)

Phylum Arthropoda (Sept. 3) - Arthropod Classes Phylum...

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  Arthropod Classes Phylum Arthropoda External Characteristics (10) 1. Segmented appendages 2. Segmented body 3. Body covered by exoskeleton (vs. endoskeleton) a. Mechanical protection i. Increased leverage/strength (attach farther from joint) ii. 6x as strong as vertebrate tendons b. Prevent water loss i. Small organisms have higher surface to volume ratios (loose more heat and water) 4. Bilateral symmetry 5. Complete digestive system a. Mouth and anal opening 6. Excretion a. Remove waste from body via malpighian tubules (mammals use kidneys) 7. Blood Circulation a. Open- haemocoel- fluid filled body cavity 8. Respiration a. Spiracles and trachae 9. Nervous system a. Ventral nerve cord 10. Most have sexual reproduction a. Some aphids= parthenogenesis Arthropod Classifications 1. Crustacea a. Include crabs, lobster, pill bugs, shrimp, daphnia, copepods b. Anatomy i. 2 pairs of antennae ii. 5 or more pairs of legs iii. 2 body regions 1. Cephalothorax 2. Abdomen c. Importance i. Important food source ii.
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  • Fall '07
  • Bay
  • i., i. Importance

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