Arthropods are invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages: https://www.inaturalist.org/taxa/47120-Arthropoda
Insects are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs (6 legs!), compound eyes and one pair of antennae:
https://www.inaturalist.org/taxa/47158-Insecta
Non-insect arthropods like spiders, centipedes, and pill bugs are welcome additions, but you should also document true insects from 3 different orders during the semester for our iNaturalist project.
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