beady long legs

The Beady Long Legs (ダマグモ?, lit.: "Orb Spider") is a boss in the first two Pikmin games. The only attack it has is stomping around, and its big feet crush any Pikmin they land on. Its weak spot is its orbicular torso; given its height, Yellow Pikmin are recommended. When defeated, it crumbles into dust and disintegrates after its belongings drop from its orbicular torso. The creature is in both the main game and Challenge Mode of both games it appears in.
In Pikmin 2, the Beady Long Legs is colored with golds and browns, while in the first game it is primarily yellow and red and lacks the shiny, bumpy texture that it has in the second game. Its legs also appear more rectangular in Pikmin. Its appearances in the second game are slightly more common, with it having much less health, slower movements, a different shake, and makes different sounds. When at low health in either game, the Beady Long Legs will start smoking at its joints, and the creature's body will begin to flake away.
The Beady Long Legs does not appear in Pikmin 3 or Pikmin 4 but it is mentioned in entries of the Piklopedia regarding new Arachnorb bosses similar to it, the Shaggy Long Legs and Baldy Long Legs.

In Pikmin, the fastest way to defeat the creature is to have around 20 Red Pikmin and around 6 Yellow Pikmin with you. Before the boss lands, use the C Stick on the GameCube controller / the + Control Pad down on the Wii Remote to organize your party so that Red Pikmin are the closest to you. Walk into the arena, and begin throwing Red Pikmin so that they attach to the creature when it lands; when the Beady Long Legs falls down, its core reaches low enough for non-Yellow Pikmin to be thrown at it. Throw as many Pikmin as you can, using the swarm trick. When it shakes the Pikmin off, a few of them will remain attached. Carefully whistle the ones that got knocked down and throw them at the core again. The creature should be dead just as it's shaking the second time.