The Joustmite is a green beetle-like creature in Pikmin 3. They are part of the Unknown Family since their true family is currently unknown, however, the Flighty Joustmite seems to be from the same family.
The Joustmite is really similar to the Cloaking Burrow-nit in behavior. Both hides partially buried in the ground, waiting for the captains or their Pikmin to get near them. They will then emerge and try to impale them with their long needle-like snout before eating them. Unlike the Cloaking Burrow-nit, the Joustmite can eat 3 Pikmin rather than just one. Rock Pikmin are immune to its attacks.