Blue Pikmin

The Blue Pikmin is a species of Pikmin that was discovered by Captain Olimar during his first visit to PNF-404.

Description
These blue variants of Pikmin are the only known semi-aquatic Pikmin to have been currently discovered. They appear to have a "mouth" in front of their faces, but the only main function for this mouth is to take in oxygen directly from water, in a similar manor to that of fish gills. This specialized adaptation allows Blue Pikmin to live almost completely underwater, though they are still capable of traveling on land if need be.

This special ability is unique to Blue Pikmin, so it can be speculated that this species in particular evolved from specific Sutera cordata that grew closer to water.