Unknown Family

The Unknown Family refers to creatures with no known family in the Pikmin series for various reasons. This can be because they only appeared in a game without a system of family classification like all enemies created in Pikmin 3 were before Pikmin 3 Deluxe intoduced a new Piklopedia. This can also be a completly assumed choice from the developers like for the Gatling Groink, which is listed as a creature without a known family in Pikmin 2 despite the game having a comprehensible family classification system.

Berserk Leech Hydroe

The Berserk Leech Hydroe is a unique case and is not a normal creature. It is an unamed type of plant that became extremely huge and agressive toward anything getting close to it because the Leech Hydroe, an otherwise harmless creature that act as a parasite to plants, that lived inside it went berserk after absorbing the Sparklium Converter, a fuel container for Hocotatian ships. The Berserk Leech Hydroe turned into a gigantic moving plant with three heads resembling venus fly traps, four legs supporting its enormous body and the ability to fly as well as creating very toxic poisons. It is one of the largest creature in the whole series and the only one that was created indirectly by Olimar's actions, its very dangerous and the fact that it is holding what is basically the fuel tank of the S.S. Dolphin II made it the final boss of Hey! Pikmin.

Fireflinger Groink/Magmaceps infernalis

Fireflinger Groinks are biomechanical creatures found in Hey! Pikmin. Like the Gatling Groink, which is assumed to be a distant relative, it is according to Olimar one of the most evolved creature he has ever seen, to the point where they have both organic and mechanical parts naturally. This allow them to fire huge flaming chunks of rocks from their mouth effectively crushing anything that would stand where they choose to aim.

Gatling Groink/Megaplod calibersi

Gatling Groinks are biomechanical creatures found in Pikmin 2. Like the Fireflinger Groink, which is assumed to be a distant relative, it is according to Olimar one of the most evolved creature he has ever seen, to the point where they have both organic and mechanical parts naturally. This allow them to fire projectile at very high speed to the point where they can actually create very dangerous commotions on impact, which makes them one of the most agressive and dangerous predator on PNF-404, on top of that, they can "repair" themselves if they are killed and left alone too long.

Goolix/Binuclei siphonophorus

Goolix are ameoba-like creatures found only in Pikmin. It is mainly composed of a water-like liquid and possess two cores that can be smashed together to cause it damage. Since it has a watery body, only Blue Pikmin can survive in its body.

Mamuta

Mamuta are stone-like creatures that are usually harmless to Pikmin and burry them in the ground, which turn them into flowered Pikmin. They live exclusively by eating plants and seeds, which explain why they try to plant Pikmin into the grounds since they usually cultivate regular plants in the same way.

Mitite/Mitivius infiltratus

Mitites are insect-like creatures that parasite eggs from other creatures to lay their own eggs leading to the original eggs bursting in a myriad of Mitite if it is broken. The Mitites are harmless creatures outside of their parasitic nature but they produce a pheromone that force most creature to swallow them, which let them access their eggs by traveling through their bodies. This pheromone is however very much disliked by the Pikmin who enter in a state of panic when they are in presence of Mitites. The most efficient way of dealing with them is by throwing Purple Pikmin in the swarm, squashing most of them and releasing the Nectar stored in their bodies.

Pearly Clamclamp/Lapis regrettabilis

Pearly Clam Clamp are clam-like creatures found in Pikmin. They periodically close their mouth when the Pikmin tries to destroy the bubble of water surrounding the item stored in said mouth. This cause all Pikmin in its mouth to be eaten.

Plasm Wraith

The Plasm Wraith is a watery creature very similar to the Waterwraith who appear to be some kind of similar entity and serves as the final boss of Pikmin 3. It seems to be extremely intelligent for a wild creature and possess the ability to separate its body in semi autonomous entities that can copy other wild creatures such as Red Bulborbs or turn themselves in elemental plasms, which allow it to have relative control over fire, water, crystals or lightnings. The Plasm Wraith also display the ability to negate gravity and start flying without the need to physically elevate itself. It can also regenerate completly even if it is mostly destroy and appear completly fine after it is destroyed for the first time and reappear in perfect health in the ending cutscene no long after the second fight against it, Alph even comment on how it could be immortal. It seems to see Olimar as a precious treasure and attacked the captains because they were trying to take Olimar away from it.

Smoky Progg

The Smoky Progg is a malformed Mamuta larva that serves as an optional boss in Pikmin. It is a purple eyed creature with two arms and made of green poisonous smoke that can kill Pikmin instantly.

Ujadani

Ujadani are creatures that resemble ticks found only in Pikmin 2. Ujadani are found in several days. Only White Pikmin can affect it and others are poisoned. Destroying them will produce more nectar. They are the only enemy in this game to not be referenced in the Piklopedia of Pikmin 2 and as such has no known family. Their name comes from their E-Reader card.

Waterwraith/Amphibio sapiens

The Waterwraith is a watery purple creature with the ability to anchor its physical form into another dimension found in Pikmin 2. It is unique and is only found in the Submerged Castle where it appears after the two captains wait too long on a floor and will go directly for them disregarding the existence of the Pikmin and crushing anything on its way with its two stone rollers. The Purple Pikmin are the only thing that can disrupt its transdimensional ability and force it to manifest its physical form and making it vulnerable, however, those Pikmin can only be found at the bottom of the Submerged Castle and cannot be taken into the cave.