AnimalsArthropods — Phylum Arthropoda
Animal with an exoskeleton, segmented body, and jointed appendages.
Quick links: butterflies, dragonflies, lady beetles, grasshoppers, spiders

Insects — Class Insecta
Six legs, head, thorax, and abdomen. Flies or crawls.
Arachnids — Class Arachnida
Eight legs. Crawls.
Millipedes — Class Diplopoda
Two legs per segment. Crawls.
Common Pillbug
Crustaceans — Subphylum Crustacea

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Unless otherwise noted, we are following for taxonomy of arthropods. We would have liked to use ITIS as the exclusive authority on taxonomy, unfortunately it is lacking many entries for insects and spiders.