page_title: List of arthropod orders
hierarchical_section_title: List of arthropod orders
context_page_description: Arthropods are invertebrate animals with a chitinous exoskeleton, segmented bodies, and jointed legs. The phylum Arthropoda contains numerous taxonomic orders in over 20 classes.
context_section_description: Arthropods are invertebrate animals with a chitinous exoskeleton, segmented bodies, and jointed legs.  The phylum Arthropoda contains numerous taxonomic orders in over 20 classes.
caption: Marrella, one of the puzzling arthropods from the Burgess Shale
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