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Rakhari; (left) Planet: Rakhar, Gamma Quadrant. A species of humanoids with heavy ridges down the nose and lots of bushy hair. They know about civilizations with warp technology but are not afraid of them and avoid contact with other races. Their system of justice is severe. Lawbreakers are put to death along with their entire family. DS9 "Vortex" 1-12
Rakosans;
(right) Kellan.
First Minister of planet Rakosa V, a highly populated Class-M planet in
the Delta Quadrant. Over two million Rakosans were threatened in 2372
by Dreadnought. VOY "Dreadnought" 2-33
Ramatisian;
(left) Planet: Ramatis III. A planet a long way from the Federation.
These humanoids are very much like humans but the ruling family of the
planet lacks the gene for hearing and all are deaf. They usually have a
chorus of helpers that are mind readers and communicate with others. TNG "Loud As
A Whisper"
2-31
Redjac; Name given to unidentified killer of women on Earth. Also known as Beratis on Rigel IV. TOS "Wolf in the Fold" 2-43
Reegrunion; Arms trader Plix Tixiplik is a member of this species. DS9 "Sanctuary" 2-30
Remans; Humanoid but reptilian looking, this species is native to the dark side of Remus, the sister planet to Romulus. They are very light sensitive. The Remans are servants to the Romulans. None of them have anything to do with governing the planet however they make good infantry soldiers. MOV “Nemesis” 10
Remmilian;
Planet: Remmil VI. A sentient species know to the Federation. Their
building construction consists of crystalline webbing. This is observed
in their central museum. 
DS9 "Heart Of Stone" 3-60
Repto-Humanoids; (right) The Planet was dubbed "Planet Hell" by the crew of Voyager. Paris and Nelix encountered a just hatched infant on the planet and tried to feed it because it was crying. When the mother showed up, they realized that the infant was subsisting on the vapors of the plane. VOY "Parturition" 2-23
Rigelian; (left) A humanoid race living on Rigel V. Their
physiology is very similar to Vulcans. They have not achieved
spaceflight but do maintain open relations with the Federation. Since
most of Rigel V is uninhabitable, the Rigellians live deep in
subterranean caves filled with an ancient system of atmospheric
force-fields, oxygen recyclers and heating systems. Their technology is
sufficient to maintain their habitat. Their existence does give much
weight to the "lost colony" theory. Star
Trek. "The Cage" 0-0
Rodulans;
The trader Kivas Fajo owned the Rodulan Basotile, an antique metal
sculpture. The Basotile was confiscated when Kivas Fajo was arrested
for kidnapping Data and killing several of his own gang. TNG "The Most Toys" 3-70
Romulans;
(right)
With the same pointed ears and converging eyebrows, Romulans bear a
very striking resemblance to the Vulcans. For good reason: they are the
descendants of a split from Vulcan society two millennia ago. So it is
assumable that their physiology is nearly identical to the Vulcans,
except in smaller aspects that are the result of evolutionary
adaptation to Romulus conditions. The ears are less pointed than their
Vulcan counterparts, and their features less severe. Though identical
in almost every way to their cousins, the Romulans lack the rigorous
mental disciplines developed by the followers of Surak. This and the
more benign environmental conditions on Romulus have gradually worn
away the physical capabilities of Romulans in comparison to their
ancestors.
Society
In
Romulan society, military rank influences social standing. Because
Romulans are militant civilizations who consider defending the Empire
and their own personal honor of foremost importance, military service
and accompanying rank are decisive factors in determining social
eminence. It is a society with a clearly defined caste system. Every
Romulan is accorded a social standing associated with the power and
military rank he commands. The highest ranked Romulan is the "Fvillha",
or chief Praetor, the Speaker of the Praetorate. He holds immense
power, and those under him rank progressively lower to end with the
lowest of the low, prisoners. Prisoners of the Romulan state are
scorned as less than Rihannsu, as Romulans identify themselves. Without
honor, they rank lower than even slaves.
The pillar of the Romulan political organization is the House system. It is a clannish system with hereditary succession to continue the lineage. However, the House is not as narrow in scope as a feudal family, as it encompasses a larger cross-section of society. The servants of a House adopt its name as their own, and though they are not equals to their masters, they are considered part of the House. As with each individual Rihannsu, a House is accorded a social rank and status according to the culminative status of its members and its past service to the Empire. The status of a House can be generalized into two categories, the Greater House and the Lesser House. Both are integral to the social structure of the Romulan Empire. The most important person within a house is the hru'hfirh, or Head of House, and each member of the house is given a station to function in. As adoptions are common in Romulan society, adopted Romulans are accorded the same status and prestige they would have held within their own biological House. However, the adopted may have to bear responsibility to two Houses instead of one. The number of members within a House reflects its social prestige, with more being better. An unique form of revenge in Romulan society is done by kidnapping young children of the rival House and rearing them as their own. Children taken in this way are usually never seen again.
Respect and honor form the basis of Romulan
society. A lack of deference to one's rank is to show a lack of
"mnhei'sahe", or "the ruling passion", an appreciation of honor, duty,
courtesy and strength. With Romulans, a successful negotiation must
leave all parties satisfied that they were dealt with honor. Their
status, their "face", must be acknowledged during the proceedings and
remain intact after the encounter. To deny a Romulan appropriate
mnhei'sahe, the offended Romulan may initiate a duel to restore his
honor, or if the disgrace is too great, surrounding parties may decide
to preserve the memory of his honor and kill him before further damage
is done. Mnhei'sahe is not clearly defined in statutes, but it is a
long-standing custom of showing deference and honor and guides the
lives of all true Romulans. Every Romulan knows by the actions and
bearing of another exactly what rank and social status he has. Subtle
observed cues, previous reputation, current military rank, and past
experience all determine the level of respect accorded to a Romulan.
Though
honor is as integral a part of their society as Klingons, Romulans are
not so physically violent or interested in dying gloriously. They are
however, extremely suspicious of all aliens and will believe only one
of their own. Their words are kept with the knowledge that failure to
do so will mean a fate worse than death: dishonor.
The
main force in Romulan life is honor, but they also acknowledge the
reality of power. The goal of every Romulan is gaining power -- if not
for themselves then for their House and the Empire. The loyalty of
Romulans for the Empire is unquestionable, and the nationalism of
Romulans can always be counted upon in times of conflict. It is their
belief that if mnhei'sahe is with the Empire, glory will remain with
Romulans. TOS "Balance of Terror" 1-14, TAS,
TNG, DS9, MOV,
ENT
Ramuran;Technologically advanced civilization from the
Delta Quadrant. Their bodies produced a pheromone that blacks long-term
memory engrams in other species, so that any encounter by a non-Ramuran
is forgotten by the non-Rumuran within a matter of hours. The
government did not allow any of its citizens to leave their society,
enforcing this law with "tracers." VOY
"Unforgettable" 4-98
Rutian; (left) Humanoids from Rutia IV. Very similar to Terrans and distinguished by their hair. Their males are marked by a distinctive white streak and females usually have red hair. Rutia IV is politically neutral in most aspects but it seeks outside help against an insurgency movement called the Ansata. While their are only around 200 active members on a planet of 4 billion, they are known to have millions of sympathizers and supporters. Rutians have spaceflight technology only sightly behind modern standards. They have significant fleet of scientific and commercial ships with a long history of trading with the Federation. TNG "The High Ground" 3-60