Phylum Arthropoda
Jointed Appendage
Phylum Arthropoda is a diverse group of organisms that includes insects, arachnids, crustaceans and others. Members of this phylum are characterized by their segmented bodies, jointed appendages, and hardened exoskeletons made of chitin.
Arthropods are found in a wide array of habitats including terrestrial, freshwater, and marine environments. They play critical ecological roles as consumers, prey, and decomposers. Arthropods are also important to human well-being, serving as sources of food, fiber, and medicine, as well as vectors of disease.
The evolution of arthropods is thought to have occurred sometime during the Cambrian explosion, over half a billion years ago. Today, arthropods represent over 80% of all known animal species on Earth.
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