1.【动】须肢
1.either of a pair of appendages that are part of the mouths of spiders and other arachnids, used for various functions including manipulating food
1.They also have long pedipalps, which function as sense organs similar to insects' antennae and give the appearance of the two extra legs.
避日蛛身上的须肢是它们的感官,类似昆虫的触角,使它们看起来多了两条腿。