This is a list of species and races from the fictional universe of Star Trek.

Aaamazzarite

In the fictional Star Trek universe, Aaamazzarites, also called Therbians, are a hairless species with pale yellow skin. Aaamazzara (Therbia), orbits Epsilon Serpentis in the Alpha Quadrant. Everything on the planet is bio-chemically produced from their mouths, including clothing and furniture. They are members of the United Federation of Planets.

To date, Aaamazzarites have only appeared in Star Trek: The Motion Picture. Nothing has been revealed about them in dialogue, so their backstory is considered semi-canon.

Aenar

Aenar, a humanoid species in the Star Trek fictional universe. Along with the Andorians, they inhabit the world of Andor (Andoria). They resemble the Andorians in physical appearance; they have white hair and antennae atop their heads. However, their skin is a light blue/white color, they are almost totally blind, and they have powerful telepathic abilities. Aenar are pacifistic and do not use their mind reading abilities against the will of another individual. Aenar government, such as it is, has little structure; leaders of Aenar society are chosen as the need arises, usually when contact with outsiders is called for.

The Aenar population is approximately 1,000 in size and they inhabit the polar region of their world. Andorians believed the Aenar to be mythical creatures before their existence was confirmed circa 2104.

The Aenar were first seen in the episode "United" on the television series Star Trek: Enterprise.

Andorian

Angosian

Angosians is a fictional race in the television series Star Trek.

Usually considered non-violent, Angosian authorities were responsible for genetically and chemically engineering soldiers to fight in their Tarsian Wars . But the process was irreversible, and the 'super soldiers' were considered outcasts and criminals that could not function or co-exist alongside the normal population of Angosian society, and as such were forced to be permanently confined to a penal settlement on an Angosian moon.

Seen in: 'The Hunted' - TNG season III

Antedean

Antedeans are an ichthyohumanoid species which resemble fish. This race was first encountered in the episode Manhunt.

The Antedeans home planet is Antide III and while a member of the United Federation of Planets they seldom receive visitors and so have not been seen by many members of the Federation. Another trait that keeps them from interacting with their fellow Federation members is a strong distaste for space flight. Interestingly enough, while a space-going race, space travel is also quite traumatic for the Antedeans. In order for individuals to deal with this problem they bring on a half-lidded catatonic state while in space flight. To awaken from this state takes several hours. Once awakened from the sleep Anteadeans are generally ravenous and eat large portions of vermicula.

There is a division in the Antedean race on whether membership in the Federation is a good thing. Ambassador Lwaxana Troi foiled a plot on Stardate 42859.2 when a group of Antedeans tried to sabotage their planet's Federation membership conference on Pacifica.

Antican

The Anticians are a species of aliens from Star Trek. They are slightly cat-like with dark fur and white hair. They applied for Federation membership but the ruling decision was put off because of their hostilities with their neighbors, the reptilian Selay. In a quest for meat, the Antician diplomatic team supposedly cooked and ate a member of the Selay delegation.

Arcadian

Arcadians are a species in the fictional Star Trek universe.

They have large, round, doll-like heads and have hair on the left & right sides of their heads with none in the middle. Arcadians are members of the United Federation of Planets with a representative on the Federation Council. They joined at least as early as the 2280s.

To date, an Arcadian has only been seen in Star Trek IV: The Voyage Home.

Arcturian

Arcturians are a species in the fictional Star Trek universe known for their clones.

Arcturian clones have the appearance of melted skin and hail from the from the densely populated world Arcturas , presumably in the Alpha Centauri system. They provide the backbone of the Federation infantry, as billions of new soldiers can be cloned overnight. It is noteworthy that Arcturians were never mentioned during the Dominion War.

To date, Arcturians have only appeared in Star Trek: The Motion Picture. Nothing has been revealed about them in dialogue, so their backstory (by Fred Phillips and Robert Fletcher ) is considered semi-canon.

Augment

Bandi

The Bandi are a humanoid species native to the planet Deneb IV in the Alpha Quadrant. The Bandi appealed to the United Federation of Planets for membership in 2364 but were rejected due to the fact that they had captured and enslaved an alien life form. The Bandi's first appearance was in the Star Trek: The Next Generation first episode "Encounter at Farpoint".

Perhaps purely by coincidence, "Bandi" was the name of a vaguely ursine empathic parasite in an early Star Trek story premise by David Gerrold, who was involved in the development of Star Trek: The Next Generation, and who novelized Encounter at Farpoint.

Berellian

Berellians are an alien race referred to once in the Star Trek: The Next Generation episode "Redemption".

When Lieutenant Commander Data takes temporary command of the USS Sutherland during the Klingon Civil War, his first officer on the Sutherland, Lieutenant Commander Thomas Hobson, implies that, as an android, Data is out of place commanding a Federation starship. Hobson compares the apparent dichotomy to that posed by a Klingon counselor or a Berellian engineer; "they're just not suited for those positions."

Betazoid

Betazoids are a sentient humanoid species from the planet Betazed, a member of the United Federation of Planets. Physically, Betazoids closely resemble humans with the sole distinguishing physical characteristic that their irises are totally black. The Betazoid brain contains the paracortex, which is a lobe devoted specifically to telepathy. Betazoids are empathic and telepathic (they can communicate telepathically with other Betazoids and some other aliens, and can sense the emotions of a wide variety of species). Betazoid/human hybrids (like Deanna Troi), however, are just empaths, not telepaths (although still able to communicate telepathically with full Betazoids).

The REM frequency of sleeping Betazoids is different than that of most humanoids.

Because they can sense the emotions and sometimes thoughts of others, their culture has evolved to be totally honest and nonprivate; for example, their wedding ceremonies are performed in the nude. Betazoids feel uncomfortable around species whose minds they cannot read (including the Ferengi and the Breen).

The gestation period for Betazoids is typically 10 months. At around age 40, Betazoid females enter a period of increased sexual desire called "the phase."

At one time, it was fashionable for Betazoid women to wear elaborate wigs that encaged small animals. The practice, which was cruel to the animals, was stopped when one (unknown) woman stood up against it.

The Betazoid word imzadi means "beloved.", although in the (non-canon, like all Star Trek books) novel "Imzadi", by Peter David, the meaning is expanded to mean "the first", as in the first to touch one's soul. This explains why Troi calls Riker imzadi when they meet in the episode Encounter at Farpoint, even though they had not been lovers for years.

Bolian

The Bolians are a fictional alien race in the Star Trek universe. They are bald with blue skin, with a small ridge running from the back of their heads to their noses. They were named after a regular Star Trek director, Cliff Bole . Their home planet is named Bolarus IX, and as an in-joke there have been references to the "Cliffs of Bole" on their planet. Neelix remarks that malfunctioning toilets will hit the Bolians especially hard, and during medical examinations 24th century doctors will commonly ask if a human patient has had sexual relations with a Bolian.

The Bolians have been active members of the Federation since 2320. Aside from contributing to the ranks of Starfleet they have a delegation within the Diplomatic Corps . In 2366, the Bolian government was maintaining an uneasy truce with the Moropa (TNG: "Allegiance").

The Bolians are known to make a crystal steel that is highly prized. They also own and operate the famous Bank of Bolius. In 2373 , the Bolian government authorized the Ferengi Gaming Commission to manage their gambling emporiums.

During the Bolian Middle Ages the Bolians developed the medical philosophy known as the "Double Effect Principal " about euthanasia. This form of assisted suicide states that while euthenasia has the effect of relieving suffering it also has the effect of causing death. Bolian marriages often involve more than two members. Any additional spouse is referred to as a "co-husband" or "co-wife", respectively. Bolian blues is a highly apreciated musical genre among Federation species.

Borg

Breen

The Breen are a species in the science fiction franchise Star Trek. They wear suits which generate an arctic environment inside them; this is because their homeworld is believed to be an arctic wasteland. They have never been seen on the show outside their suits. They established the isolated Breen Confederacy in the Alpha Quadrant and became a powerful ally of the Dominion of the Gamma Quadrant.

The Breen have established mining facilities consisting of Breen guards and kidnapped workers (from spaceships), such as Tora Ziyal, Gul Dukat's daughter.

The Breen suits are usually thought of as refrigeration suits, but some speculate that the Confederacy is a comfortable environment (from the Cardassian point of view). The helmet of the suit consists of a glowing green visual piece and a beak, which seems to suggest the Breen have an unusual facial structure. The Breen have no blood or any similar liquid circulatory system.

The Breen eat algae paste, which is probably the only plant life that grows in an arctic environment.

The leading representative of the Confederacy to the Dominion is the Thot (similar in rank to a General).

Although the Breen appear almost exclusively in episodes of Star Trek: Deep Space Nine, one Breen appeared as a hologram enhanced by the Hirogen in Star Trek: Voyager.

Briori

The Briori are a fictional race of aliens, mentioned in the Star Trek: Voyager episode "The 37's", who routinely kidnap beings from worlds throughout the galaxy to be used as slaves. In the year 1937, the Briori abducted hundreds of humans from Earth and brought them to a world in the Delta Quadrant to use as slave labor. However, this proved to be short lived, as the humans revolted, killed the Briori, took their weapons and technology, and established a civilization on the planet. The Briori may be related to the Skagarans, another slave-owning race featured in an episode of Star Trek: Enterprise.

Bynar

The Bynars are a highly intelligent species who have become almost machine-like due to a constant connection with their homeworld Bynaus's master computer. The Bynars first appeared in the Star Trek: The Next Generation episode "11001001".

The Bynars are asexual beings roughly the size of regular Human adolescent. They have over-sized heads to make up for a large brain. The Bynar skin-tone is purplish in color. The Bynars are an official member of the United Federation of Planets. Due to the Bynars total dependence on their master computer they have become so machine-like that their speech is essentially a form of binary code. Hive-like in nature, disconnecting a Bynar from the master computer or each other is near fatal. Due to this total interconnectivy, and their ability to speak in machine language, they are able to communicate at a rapid rate. So fast in fact that they require the aid of data buffers to be built into their clothing. It should be noted that, not surprisingly, the Bynars are known throughout the Federation for their skill with computers.

Cardassian

Changeling

Changelings are an alien race from the Star Trek universe. They are called Changelings because of their ability to shape-shift. The Changelings were introduced in the Star Trek spin-off Star Trek: Deep Space Nine. Constable Odo, one of the regular characters on that show, is a Changeling.

Their natural state is a liquid protoplasm. The Female Shapeshifter once told Odo that their race once had bodies similar to those of other species, but they had since evolved beyond those physical bodies. Changelings have the ability to meld together (in a process known as "linking") to share information and emotions in a very intimate manner. The Changeling homeworld is covered in a sea of Changelings known as the Great Link.

Changelings can turn themselves into almost anything and can flow through any gap in their gaseous or liquid state. When they assume a different shape, such as a rock, scanners will show them as a rock. Changelings who have sufficently disciplined their shapeshifting abilities are able to turn themselves into convincing imitations of others. However, if a part of a changeling is separated from the whole, it reverts to the liquid state. In addition, a Changeling must regenerate, returning to its liquid form once every sixteen hours.

The Changelings are native to the Gamma Quadrant. All but one hundred of the Changelings are Founders, the rulers of the Dominion. (Odo is one of The Hundred). They seek power because they were once persecuted by non-shape-shifters, whom they call "Solids." After the discovery of the Bajoran wormhole and the subsequent war between the Dominion and the United Federation of Planets, the covert Federation group Section 31 created a disease that prevented the Changelings from shape-shifting. When the Dominion was defeated, the Changelings were cured.

Deltan

In the fictional Star Trek universe, the Deltans are a closely humanoid species, probably Federation members. Only one confirmed Deltan has been seen on screen, Lieutenant Ilia in Star Trek: The Motion Picture, although the novelization of Star Trek II: The Wrath of Khan identifies at least one of the scientists on the Regula 1 space station as Deltan. Presuming she is typical of her species, Deltans (or at least female Deltans) are most notable for having bald heads. They have a limited telepathic ability, allowing them to stop another person from feeling pain by touching them.

Ilia reported that her "Oath of Celibacy" was on record when she reported to Kirk. While the original theatrical release does not expand on this, later revisions include dialogue establishing that she is "as safe as any Human," and that she would never take advantage of a less advanced species. It is widely reported in off-screen sources that Deltans emit extremely powerful pheromones, provoking a strong sexual reaction in many other species. Deltan culture is also said to heavily emphasise sexuality - Roddenberry once said that to a Deltan, sex is like a handshake. Deltans in Starfleet were thus forbidden from engaging in sexual activity so as to limit their disruptive influence on other species.

Denobulan

The Denobulan are a fictional humanoid race in the Star Trek universe. They were introduced in the Enterprise series. They originate from the planet Denobula Triaxa. Doctor Phlox is a Denobulan.

The Denobulans are humanoid with facial ridges. They have no need for sleep but they do hibernate for 6 days a year. When threatened, Denobulans can inflate their heads like blowfish to scare off predators. Denobulans are also expert climbers, thus making them suitable for exploring caves, canyons and other sheer rock formations.

Denobulans are polygamous, with each Denobulan typically having 3 partners that also have 2 other partners, creating a large social network. They have complex mating rituals, and they don't like to be touched. Denobulans usually don't have pets, and they abandoned television a long time ago. They believe that their real life is much more exciting. Despite their rather liberal views on sex, Denobulans are exceedingly modest when it comes to disrobing in front of others.

Denobulans used to be xenophobic, but they got over it and now enjoy contact with other species. They were once at war with the Antarans, a neighboring species. They established friendly relations with Earth at least before 2151.

El Aurian

El Aurians are a humanoid Race of from the science fiction television show Star Trek. They were first introduced in season 2 of Star Trek: The Next Generation with the character of Guinan.

El Aurians physically look similar to Humans but they can live well over 700 years. They also have an awareness beyond the normal flow of time and space and can detect changes to time even though they may not be aware of exactly what those changes were. El Aurians may have other unknown powers.

The El Aurian homeworld is located in the Delta Quadrant in the El-Auria System and was assimilated by the Borg in the mid 23rd century. Very few survived and those that did were scattered throughout the galaxy some of the refugees eventually came to the Federation.

They are considered a race of listeners and often appear very patient and wise.

Ferengi

Gorn

The Gorn are highly intelligent reptilians from the Beta Quadrant in the fictional realm of Star Trek. They made first contact with Starfleet at Cestus III when a misunderstanding nearly led to war. The Gorn made their first appearance in the Star Trek: The Original Series episode "Arena".

Hirogen

The Hirogen are a fictional race in the Star Trek universe. They are spacefaring and nomadic and featured in Star Trek: Voyager. Resident to the Delta Quadrant, the Hirogen are roughly technologically equal to Starfleet, though have a primitive social structure, where each pack is led by an "Alpha", with a "Beta" serving directly under him.

The Hirogen view all other races as prey, and make sport of pursuing what they deem worthy adversaries. With this in mind, some far-seeing Hirogen believe their society, which has broken up into a number of factions each engaged on their own hunts, has become too divided to survive in the hostile Delta Quadrant.

Hirogen are typically much taller than a human, perhaps seven to eight feet in size. They are powerfully muscular. It can be surmised that their close combat capabilities outstrip those of a typical Starfleet officer by quite a margin. Hirogen hunters of all ranks wear tough blue armour, generally with face masks. Before a hunt, all Hirogen hunters colour their faces with some type of war paint.

Horta

The Horta are a silicon-based species, introduced in the original series episode "The Devil in the Dark".

An intelligent species indigenous to the planet Janus IV, the Horta can comfortably live in the airless and dark subterranean environment. It can also secrete a powerful corrosive which allows the instant fashioning of tunnels for travel. It also has an unusual life cycle in that every 10,000 years, most of the species dies leaving one female to lay numerous eggs and care for the resulting young.

When the United Federation of Planets set up a mining colony, the Horta tolerated their presence until the miners inadvertently broke into the egg chamber and, being unaware of their nature, began destroying the eggs. In desperation, the Horta began killing and terrorizing the miners to save her children. The USS Enterprise was sent to investigate the problem and Captain James Kirk and Mr. Spock led the hunt for the creature. Eventually, they made contact with the creature and learned of her grievance. Once fully informed about the situation, they brokered a mutually beneficial arrangement in which the miners treated the Hortas with respect while the creature helped them mine. At last report, the arrangement has proven most satisfactory for both parties.

Human

Hunter

Hunters are a species who live in the Gamma Quadrant. They are part of the Dominion, serving as navigators and trackers. To hone their skills, Hunters engage in lifelong pursuit of another, related species, Tosk. Hunters value a long, challenging hunt, preferably ending in the Tosk's heroic death. If they manage to capture a Tosk alive, they will reluctantly take it back to their homeworld and subject it to ridicule and public display. Following a hunt which was briefly interrupted on Deep Space Nine, the Hunters declared it (and the entire Alpha Quadrant) off limits for future hunts.

Hunters respect and value the Tosk they hunt; to the Hunters, Tosk are the living embodiment of all that is noble and courageous.

Klingon

Vulcan

Xindi