Arachnids have pedipalps
also called palps.
They are two sensory feelers that look like very short legs attached to the front of the spider. They help taste food.
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Pedipalps have been adapted for feeding, locomotion, and/or reproductive functions.
9.
Yes, though none have a penis. In general sperm is produced in the genitalia at the underside of the abdomen, and the male arachnid transfers that to his pedipalps (in the case of spiders at least); pedipalps are the frontmost pair of appendages next to the mouthparts. Later, he inserts his pedipalps into the female's genitalia on her underside and mates this way.
Scorpion claws are called pedipalp.
A snail is a mollusc, as are the octopus and oyster.