Chelicerae

The chelicerae are the mouthparts of the subphylum Chelicerata, an arthropod group that includes arachnids, horseshoe crabs, and sea spiders. Commonly referred to as "jaws", chelicerae may be shaped as either articulated fangs, or as a type of pincers. Some chelicerae, such as those found on nearly all spiders, are hollow and contain venom glands, used to inject venom into prey or a perceived threat.

Both pseudoscorpions and harvestmen—neither of which have that venom channel—have additional structures on their chelicerae that are used for grooming.
In many spider species, males and females have sexually dimorphic chelicerae.

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Source: Wikipedia · Image: Wikimedia Commons · CC0

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