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Great Smoky Mountains National Park

Illustrated Key to the Orders of Arachnida

Palps not modified to pincers
Without silk producing spinnerets
Without a waist or petiole: abdomen broadly joined to cephalothorax

Abdomen distinctly segmented ventrally. All mobile life stages with 4 pair of legs
OPILIONES (Harvestmen or Daddylonglegs)

Abdomen not distinctly segmented. Some individuals with 6 or fewer pairs of legs; legs sometimes represented only by setae
ACARI (Mites and Ticks)

With a petiole
With spinnerets


Palps modified to form pincers

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