Guzman - PAP Bio - 7. Juan Torres


Students meticulously study the arthropods provided to learn more about the external structure of the organism.

Arthropod (Arthropoda)

Arthropods are invertebrate organisms that have an exoskeleton, a segmented body, and jointed appendages. Arthropods belong to the kingdom animalia and the phylum arthopoda. Arthropods are usually know to have jointed limbs and cuticles. Arthropods are the most diverse organisms on the planet, meaning that the types of niches vary greatly, which means that there is not just one niche that is the responsibility of arthropods. Arthropods have many adaptations that improve their chance of survival. These adaptations include:

  • The hard chitin exoskeleton of arthropods prevent them from drying out and gives limbs a place to attach.
  • The open circulatory system of arthropods allow for nutrients to go directly to the tissue.
  • Each segment of an arthropod has its own function/purpose.
  • The cephalic shield is the fusion of segments that provides better defense for the body.

Skeletal system of the Crayfish and the Grasshopper!

The skeletal system of the crayfish has many parts to it, but its main roles are to protect the body, provide support for the body, and help in movement of the body.

The skeletal system of the grasshopper includes many parts to it, such as the foregut, midgut, and hindgut. The primary function of the skeletal system in the grasshopper is to protect, support, and move.

Test your knowledge of arthropods by taking this quiz!


  1. The ancestral arthropods were the first land animals.
  2. The oldest arthropod to have lived on land is the Pneumodesmus newmani.
  3. Arthropods have segmented bodies.
  4. Arthropods have an exoskeleton.
  5. Arthropods evolved about 500 million years ago!


"Baby, You're an Arthropod!" Song about insects, crustaceans, arachnids & more by Lucas Miller