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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 appendages of Arthropods are jointed. Each body segement has a pair of appendages. The original structure of Arthropod appendages was likely to have been biramous.Modern â¦ Arthropods can have either biramous or uniramous limbs.Biramous limbs branch out into two. An arthropod is an invertabrate animal that has an exoskeleton, a segmented body, and jointed appendages.    An ANTHROPOD is a bipedal humanoid (ie Homo Sapien, Homo Neanderthalus, Homo Habilus, Australopithicene Afarensis, and other hominids).