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Arthropods are a very old phylum, dating back to the Cambrian period (535 million years ago) and perhaps earlier. Trace fossils made by arthropods date back to 535 million years ago, and Spriggina, an enigmatic trilobite precursor which may be an arthropod, dates to 555 million years ago.
All arthropods have segmented bodies divided into a head, thorax, and abdomen. In some cases, such as with the lobster, the head and thorax are fused together.This is called a cephalothorax. Arthropods also have jointed appendages. Arthropods have a complex internal design, with ganglia for a brain and an organ that acts as a heart.They have a complete digestive and excretory system. They also have well-developed sensory organs, that include antennae, eyes, and in some cases internal ears.ll arthropods have segmented bodies divided into a head, thorax, and abdomen. In some cases, such as with the lobster, the head and thorax are fused together.