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Planet of origin: Efros
Affiliation: United Federation of Planets
Warp capable: Unknown
Classification: Mammalian humanoid
Environmental requirements: Class M conditions
Typical lifespan: Unknown
Sexes: Male and Female
Telepathic abilities: Possibly present among warrior-priests
Blood Coloration: Unknown
Distinctive Features:
Slight cranial ridges
Racial Sub-divisions:
Varied skin, hair, and eye colouration

Efrosians are a species of humanoids native to the planet Efros, or Efros Delta. Members of the United Federation of Planets they are notable for their dedication to oral history, and for their musical language.

FASA's RPG book, Star Trek IV: The Voyage Home Sourcebook Update, identifies this planet as the fourth planet of the Flarset system. The alternate name "Efros Delta" is from the TTN novel Taking Wing.



Efrosians are very similar in appearance to Klingons, save for the very slight cranial ridges in comparison to a Klingon's full crest, and a copper skin complexion. Their faces contain fatty deposits inherited from their primitive ancestors who neglected to cover their faces from the harsh cold of the planet Efros. Males tend to have white or blonde hair while females usually have black or dark brown hair. It is typical in Efrosian culture for the males to grow lengthy moustaches,and most Efrosians wear their hair long. Efrosians have two stomachs and require the oils found in Levithi nuts in order to remain healthy. These nuts are found only on Efros Delta, but are exported to other Federation worlds where Efrosians live. (TTN novel: Taking Wing). Most Efrosians have weak eyes but compensate with a heightened sense of smell. Some Efrosians who are blind can correct this disability with a type of special mechanical glasses. Interestingly, despite their poor eyesight Efrosians appear to have a greater range of vision than Humans, being sensitive to a wider portion of the spectrum. (TTN novelization: Sword of Damocles)

An inherent ability is their uncanny sense of direction. This is believed to have originated as a survival mechanism to deal with their world's often blinding snowstorms. As a result, Efrosians are often sought out as navigators.

Society and Culture


Cultural development

Efrosian culture is the result of living on the harsh, frozen world of Efros Delta for generations. Both technological and social development were minimal during the millennia-long ice age that ravaged the planet. Close-knit tribes formed out of a need for survival. Once the immense glaciers began to break up, the planet eventually united.

Efrosians prefer to specialize in one area of expertise.

The Efrosians do not have a written language. Although introduced to the concept by other civilisations, the Efrosian culture is still based on memorising oral history, with libraries resembling other worlds' music archives. Furthermore, the Efrosian language is music based, which is more common among aquatic species such as the Alonis than mammalian humanoids. (TTN novel: Taking Wing)

Efrosians lack the concept of monogamy found in many other humanoid cultures, however this lack of monogamy does not necessarily translate into sexual promiscuity. Still, Efrosians consider sexual intercourse a useful way to learn to work well with others, helping one appreciate one's colleagues. It is actually considered somewhat rude not to flirt with someone of your preferred sex. (TTN novel: Orion's Hounds) Children are raised by their mothers alone; in fact, the Efrosian word for mother is the word which translates into English as "parent". The closest term for a father is "seed-doner". Most Efrosians never meet their father. The mother is aided in caring for the child by whatever male lovers she has taken at the time. This behaviour arose out of neccessity; given the harsh conditions on Efros Delta, males had to mate with as many females as possible, and leaving a mother dependent upon only one male, who might not return from foraging parties, was foolish. (TTN novel: Over a Torrent Sea) (ST novel: A Singular Destiny)

Efrosians are often attuned to others' emotional needs. (ST - Destiny novel: Gods of Night). They are known as an emotionally complex people (TTN novel: Sword of Damocles)


Each tribe during the ice age had at least one warrior-priest, an individual capable of exceptional combat as well as great healing. When the ice age ended, the warrior-priests soon united Efros under a religious oligarchy led by the still-revered S'skotomz.

As members of the United Federation of Planets, an Efrosian delegation sits on the Federation Council. In 2289, Ra-ghoratreii was elected President of the United Federation of Planets and served until 2300.


Efrosians are deeply spiritual, as a rule. Their religion features the same binary morality as is found in many Earth religions. The Efrosian equivalent of heaven is known as "Endless Sky", and it is balanced by a firey underworld. (TTN novel: The Red King) Efrosian funeral services feature a "death march" in honour of the deceased. (ST novel: A Singular Destiny). The Efrosian faith is rumored to obligate ts member's names not be spoken (sung) aloud, on Efros. Nothing else is known because Efrosians refuse to discuss the matter with outsiders, except to mention that their religion is what enabled them to withstand the Efros ice age. Unfortunately, this has been the subject of speculation and some Tellarites believe child-sacrifice and ritual murder are common religious practices. This guarded secrecy very much remains in place in the 24th century.


Some Federation anthropologists claim there is some evidence that the Efrosians did not originally evolve on Efros. Other anthropologists suggest that the race was seeded on the planet before its ice age by the Preservers.

Unlike other planets where technology suffered under religious rule, the Efrosian warrior-priests believe technology betters life. As the climate warmed (at a very slow rate), additional energy and mineral resources were discovered that contributed substantially to their technological progress.

First contact was made with the Federation in 2278 when the Vulcan crew of the USS Surak visited Efros. Delighted to learn of other intelligent life, the Efrosians soon joined the Federation and began educational and philosophical cultural exchanges with other worlds. Many serve in Starfleet and the Merchant Academy as helmsmen, navigators, and medical personnel (some warrior-priests have become Starfleet doctors). (FASA roleplay module: Star Trek IV: The Voyage Home Sourcebook Update)

In 2286, an Efrosian helmsman, Chitirih Ra-Dreii was aboard the USS Saratoga when it encountered the cetacean probe along the Klingon Neutral Zone. An Efrosian ambassador was also present on Earth during the crisis. (TOS movie & novelization: Star Trek IV: The Voyage Home)

In 2293, Federation President Ra-ghoratreii granted extradition of Captain James T. Kirk and Doctor Leonard McCoy to the Klingon Empire to stand trial for the assassination of Chancellor Gorkon. Soon afterward, he handled the signing of the Khitomer Accords. (TOS movie: Star Trek VI: The Undiscovered Country)

In the 24th century, many Efrosians have protested the Integrated Officer concept in place at Starfleet Academy due to their cultural preference to specialize in one knowledge area.

In 2377, an Efrosian male was serving as the chief mechanic of the Otamawan. He was killed by the Chalnoth bounty hunter Grauq. (DS9 novel: Warpath)

Noted Efrosians


The novelization of Star Trek VI identifies the Federation President's race as Deltan.

This article uses material from the "Efrosian" article on the Memory-beta wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.

ST Expanded

Up to date as of February 07, 2010

The Star Trek Expanded Universe Database is for fanon and related content. See for the canon Star Trek wiki.

Efrosian male, blind
USS Saratoga helmsman
Efrosian male, non-blind

The Efrosians are a humanoid species with red/orange skin, forehead ridges and white/blonde hair. They are members of the Federation, serving both in Starfleet and Federation government.

Due to their unique evolution, a majority of Efrosians are born blind. When traveling off their homeworld, they often need to use devices to see, such as special glasses.

One of the most famous Efrosians was Federation President Ra-ghoratreii, who served from 2289 to 2300. In 2293, he was closely involved with the Khitomer Accords.

It is rumored that addressing Efrosians by name is an insult to their religion, though obviously those in the public light don't always follow this. Other races are known to refer to Efrosians as Ateniods or Atenids, the same way some races call humans "Earthers" or "Terrans".


Notable Efrosians

  • Ra-ghoratreii (blind) - Federation President
Played by actor Kurtwood Smith.
Played by actor Nick Ramus.
Played by fan actor Edward C. Tunis III
  • So-Larynesette (blind) - 23rd century starship captain
  • Ra-Yalix (non-blind) - Foreign policy advisor, Jaresh-Inyo's administration
  • Hu'Ghrovlatrei (non-blind) - Late 24th century Starfleet admiral



The name for this species never appeared in any script, dialogue, or production graphic. It was noted, however, in Paramount's initial publicity photos for Star Trek IV.

The name "Efrosian" was invented by Kirk Thatcher, an associate producer on Star Trek IV, in honor of unit production manager Mel Efros. Probably based on the publicity photos the name was then picked up and used in the Star Trek IV Sourcebook Update to the FASA role-playing game system to describe the species. Although never formally adopted by Paramount beyond the publicity photos (the Star Trek Encyclopedia, for example, goes out of its way to avoid using the name) the name has been popular with fans.

In 2003 Decipher issued a book for their role-playing game called Aliens in which the species name was given as "Atreonid". There has been unconfirmed speculation that this was at Paramount's request, although the name "Atreonid" has not appeared in any Star Trek productions.

The Cast and Crew of Tales of the Seventh Fleet came up with the logic of Efrosians being also known as Ateniods or Atenids, the same way some races call humans Earthers or Terrans. It seemed like the best solution to combining the references of FASA and Decipher.

External links

  • Efrosian article at Memory Alpha, the canon Star Trek wiki.
  • Efrosian article at Memory Beta, the non-canon Star Trek wiki.
  • The truth about Efrosians – trivia article about Efrosians by Ian McLean

This article uses material from the "Efrosian" article on the ST Expanded wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.


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