Poisonous Burrow-Nit

This creature bears resemblance to the Cloaking Burrow-nit but has a purple shell instead, and the markings on the back are just a pair of blue swirls. The bug itself is blue with red eyes. It behaves exactly like a Cloaking Burrow-Nit except for the fact that it is enveloped in an eternal cloud of poison which only fades after the creature is defeated, meaning you can only use White Pikmin to defeat it. Apparently, the poison is actually the creature rapidly exhaling. Poisonous Burrow-Nits have pores in their backs that take in the planet's oxygen. They exhale it quickly as a poisonous gas.

Trivia

 * The blue swirls are similar to the commonly seen swirling designs in the Temple of the Ocean King in "The Legend of Zelda: Phantom Hourglass". The enemy would not look out of place in that dungeon.