palps
Arachnids. Spider group. Appendages are technically legs.
Eating and stuff
Because arachnids and crustaceans share a pair of appendages called chelicerae, which are specialized mouthparts that we find in both arachnids (spiders) and horseshoe crabs. In fact, these mouth parts define the name of the entire subphylum to which these animals both belong, the Chelicerata. There are a few different types of chelicerae, but in arachnids, these would be the mouth parts that most people think of as 'fangs,' some which are of course venomous. In horseshoe crabs, they are the anterior-most (front-most) pair of appendages, look like small claws, and are used for feeding.
Palps are a second pair of appendages found in crustacean and insects. These appendages are located near the mouth and are used to guide food into the mouth.
Scorpions are arachnids that walk with their eight appendages (legs).
Through the chelicercae are appendages located near the mouths of arachnids. Which is used to hold or bite its food.
there is a presence of modified appendages (mandibles) flanking their mouth and used as jaws.
The appendages near the mouth, such as lips and cheeks, are used for manipulating food, aiding in speech production, and protecting the teeth and gums. They also play a role in facial expressions and communication.
Correct, arachnids have no wings or antennae. However, some have forward limbs or appendages with sensory functions which might be said to act like antennae.
Yes
What you are describing is phylum Arthropoda, which houses insects, arachnids, crustaceans, and the extinct trilobites.