'Spiders, ticks, horseshoe crabs, and scorpions all have a pair of claw-like appendages near their mouths used for feeding, defense, movement, and/or sensory reception. These appendages are called chelicerae.
Chelicerae are those jointed appendages present near the mouth of some arthropods including spiders, ticks, and horseshoe crabs. The arthropods due to the presence of these chelicerae are known as the Chelicerata.
The chelicerae appendage consists of a base segment which is called the "paturon", which has the ability to articulate with the cephalothorax and a fang portion that can articulate with the base segment as well. Almost all spiders have the presence of venom glands and are able to inject the venom through openings that are present near the tips of their respective fangs when they are biting prey.
They are also considered to be mouthparts of the arthropod group that includes many varieties of arthropods. They are commonly referred to as "jaws” and may be shaped as either articulated types of fangs or the one that is similar to pincers.
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