Arthropods

The word Arthropod means jointed appendages. All arthropods have circulatory systems, so they breath through there lungs. There are over 850,000 species of arthropods. They can live on both land and water. Also their body is divided into segments. Another fact about them is they have an exoskeleton, which is a skeleton outside of their body. An exoskelton is made up of material called chitin. It protects the soft parts of there body, and prevents loss of water. Some arthropods eat there own exoskeleton after molting. They have bilateral symmetryand they must breathe through their skin. Arthropods reproduce by sexual reproduction and lay eggs on land. Arthropods breathe through gills under water, and they breathe through trachaeaand lungs when they are adults.

Arachnids
  • Different from insects because of 4 pairs of legs
  • Have two body segements
  • Can have up to 12 eyes
  • Have fangs which soften pray for eating
  • Lungs
  • Sexual Reproduction
  • Lays Eggs
  • 1-2000 Babies

Crustaceans
  • Small claws and large claws to get food
  • More appendages than Arachnids
  • Most live in water
  • Lobsters and Pillbugs are examples
  • Gills
  • Get Oxygen through water
  • Tube shaped heart
  • Compound eyes
  • Eggs

Insects
  • 3 body sections
  • 3 pairs of legs
  • More similar to crustaceans
  • Metamorphisis
  • Eggs
  • Stages for growing up
  • Have chewing mouths





Arthropods are broken down into three major subphylas including Insects, Crustaceans, and Arachnids. The insect subphyla has three pairs of legs and three body parts head, thorax, and abdomen. Some examples of insects are flies, ants, bees, and lady bugs. In contrast to insects, arachnids have four pairs of legs and two body parts head, and thorax. Examples of arachnids are spiders, scorprion, and horseshoe crabs. Lobsters and crabs are examples of crustaceans.