All three Arachnorbs.

Shaggy long legs (black)

The fourth Arachnorb

The Arachnorb family is the family of tall spider-like creatures (with four legs however). The most famous member of the species is the Beady Long Legs, the first member of the family to appear, as the only Arachnorb boss in the first game. For some reason too, all Arachnorbs have a shiny coat in Pikmin 2, but is unknown why.