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What is an arthropod?

Arthropods are a group of invertebrates, which include insects, arachnids, crustaceans, millipedes, centipedes, and others.

Arthropod diversity is overwhelming and comprises more than 75% of all species on earth.

Animals in the phylum Arthropoda share a number of key internal and external characteristics. The easiest characteristics of arthropods to identify are:

  1. Segmented bodies
  2. Paired, segmented appendages
  3. Bilateral symmetry
  4. A hard, chitonous exoskeleton

The figure below demonstrates some of these characteristics of arthropods.

Arthropod Diagram

Play an arthropod game!