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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.
The arthropod leg is a form of jointed appendage of arthropods, usually used for walking.he appendages of arthropods may be either biramous or uniramous. A uniramous limb comprises a single series of segments attached end-to-end.