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Dachlyd; Humanoid race from Dathis II. The Dachlyds are reptilian humanoids resembling upright Terran iguanas. With moderate interstellar technology, the bulk of their space travel involves refining and reselling products from Gemaris V. Dachlyd's have a habit of being quite antisocial and prefer to conduct most trade with automated cargo drones and subspace communications. Since the Dachlyds sell valuable alloys and compounds at low prices, they still make a significant profit. TNG "Captain's Holiday" 3-67
Daledian; (right) From a planet that revolves only once every planetary year, so that one hemisphere is always in light, while the other is in eternal night. Daled IV had been torn by civil war between inhabitants of the two hemispheres. In the late 2340s, two parents from opposite sides conceived a child named Salia, and sent her to the nearby planet Klavdia III to be raised in a neutral environment. Salia returned to Daled IV at age 16 in the hopes of uniting the factions and bringing peace to her world. Daled IV was not a Federation member. Daled IV citizens are actually allasamorphs and can assume any number of different humanoid shapes. TNG "The Dauphin" 2-36
Daliwakan; Humanoid life-form. A holographic character of a gigolo who frequented Chez Sandrine in a Tom Paris holodeck simulation was half-human and half-Daliwakan. VOY "The Cloud" 1-6
Dal'Rok; Cloudlike energy creature that threatened a Bajoran village for five nights every year. The village was saved each time by the Sirah, who would tell heroic tales of the village people, repelling the evil entity. In actual fact, the Dal'Rok was an illusion created from the fears of the villagers by the Sirah, who used a common enemy that would unite the people of the village. DS9 "The Storyteller" 1-14
Daran V; Inhabited planet. Daran V had a population of 3.7 million and was directly in the path of the Fabrini spaceship Yonada in 2268. Assistance by Starfleet diverted Yonada from its collision course, sparing the inhabitants of both worlds. TOS "For the World is Hollow and I Have Touched the Sky" 3-63
D'Arsay;
(left) Ancient humanoid civilization. Little is known about the
D'Arsay, except that they flourished nearly a hundred million years
ago, and that they had both spaceflight capability and a culture rich
in mythology. The fate of the D'Arsay is unknown. TNG
"Masks" 7-169
Debrune;
Long dead civilization that had a settlement on planet Barradas III.
The planet is now uninhabited. A Federation archaeological survey has
studied the planet and has cataloged numerous ruins on the surface.
TNG "Gambit, Part 1" 7-156
Delbian; (left) Race from Delb II. Although Nellen Tore, assistant to Starfleet Admiral Norah Satie, may not fairly represent the Delbian race, she herself was strikingly tall, had eyebrow creasing, and kept very much to herself. TNG "The Drumhead" 4-95
Delios VII;
Planet that was the home to the Karis Tribe. VOY
"Sacred Ground" 3-49
Deltan;
(right)
Humanoid race from Delta IV. Members of the Federation for over a
century. Deltan's have characteristically little body hair,
especially a bald head. Deltans have an inherent talent for
mathematics and geometry. The Deltan race has a very highly developed
sexuality and some form of sexual expression is inherent in most
aspects of Deltan culture. Deltans are the one known humanoid race in
which pheromones play a major role. Deltan pheromones cause powerful
sexual stimulation in almost all humanoid species. Deltans have
limited telepathic abilities. Star
Trek: The Motion Picture 1
Demon Planet Crew; The entire crew and ship were made from the mercury-like substance that covered the Demon planet. After Voyager departed, the planet created it's own Voyager and crew. VOY "Demon" 4-92
Denebian; A race of humanoids from Deneb V. The Denebians purchased all rights to a Vulcan fuel synthesizer from confidence man Harry Mudd. When they contacted the Vulcans they found the sale was a ruse. When Mudd was arrested he was given several colorful choices of execution, none of which appealed to Mudd. TOS "I, Mudd" 2-37
Denevan neural parasite; Origin unknown. an irregularly shaped gelatinous life-form analogous in structure to an oversized brain cell. The entire population of these parasites were somehow linked together to form a collective intelligence. TOS "Operation--Annihilate!" 1-29
Denobulans; Humanoid species. The Enterprise NX-01's Dr. Phlox is Denobulan. The Denobulans hail from the system Denobula Triaxa, and only require six days of sleep per year (though, according to Dr. Phlox, two will suffice). It is common for Denobulans to have multiple spouses - Phlox has three wives, who, in turn, each have two other husbands. Mating among this species is apparently very complex compared to human traditions, yet most Denobulans do not like to be touched. ENT "Broken Bow" 1-1
Devidians;
(left) Intelligent
life-forms native to planet Devidia II. The Devidians exist in a
slightly different time continuum from 'normal' matter, and thus were
only barely detectable to an observer in 'normal' time. The Devidians
thrived on neural energy that they stole from dying life-forms. TNG
"Time's Arrow, Part 1" 5-126
Devore; A formidable Delta Quadrant race who have outlawed telepathic races from their space. VOY "Counterpoint" 5-104
dikironium
cloud creature; (right)
Gaseous entity that could change its molecular form, was capable of
traveling across interstellar space, and could be recognized by a
characteristic sickly-sweet smell. The cloud creature fed on the red
blood cells of humanoid life-forms and was able to camouflage itself
by momentarily throwing itself out of time sync permitting it to be
two places at once. TOS "Obsession" 2-42
distortion ring being; A non-corporeal life-form that was a sentient spatial phenomenon capable of literally changing the shape of space. In 2372, the U.S.S. Voyager encountered a distortion ring being in the Delta Quadrant. In an attempt at communication, the anomaly immobilized the ship, disrupted communications and computer control, and caused the ship's physical arrangement to change. Only after the distortion wave had passed did the crew realize that the phenomenon was a sentient, intelligent being. During its encounter with Voyager, the distortion ring being deposited some twenty million gigaquads of information into the starship's computer memory banks. VOY "Twisted" 2-22
Dokkarans; A culture and race characterized by harmony, as reflected in the design of the temple that the orphaned Timothy tried to build with Data's help in 2368 aboard the Enterprise. TNG "Hero Worship" 5-111
Dolbargi; A
culture capable of a self-induced death-simulation technique that is
teachable to and usable by others, including Hupyrians and Ferengi --
as servant Maihar'du taught Grand Nagus Zek.
DS9 "The Nagus" 1-11
Doomsday machine; (right) Automated spacegoing weapon from outside our galaxy. Several kilometers in length, with a hull composed of pure neutronium. It smashed planet into rubble with an antiproton weapon, and used the matter as fuel. TOS "The Doomsday Machine" 2-35
Doosodarians; Ancient civilization. Doosodarian art included and unusual form of poetry that contained empty spaces, or lacunae, during which the poet and audience were encouraged to acknowledge the emptiness of the experience. TNG "Interface" 7-156
Dopterian; (left)
Semi-Humanoid race from somewhere in Ferengi space. They appear as
short humanoids with skin tones ranging from dull yellow to dark
brown. They have a cranial ridge extending from the lower rear base
of the skull and extending up through the upper rear part of the
skull. Dopterians are distant relatives of the Ferengi, theory holds
that 
Ferengi
proto-humanoids were transplanted to the Dopterian homeworld.
Dopterians have no telepathic abilities and cannot be scanned because
of their four lobed brains, a similarity to their Ferengi cousins.
TNG "Firstborn" 7-173
Dosi; (right) Humaniod civilization from the Gamma Quadrant. The Ferengi attempted to deal with the Dosi in 2370. It is believed that the Dosi have ties to the Dominion. DS9 "Rules of Acquisition" 2-27
Douwd;
(left) A little-known civilization of sentient energy beings capable
of assuming the appearance of other life-forms. Possessing awesome
powers of creation and destruction, the Douwd consider themselves to
be immortal beings of disguises and false surroundings. Their natural
appearance is unknown. 
TNG
"The Survivors" 3-51
Drakian
Forest dwellers; A tribe with paranormal
abilities known to Neelix, otherwise nondescript, who can enter and
empty room and see images of people who'd preceded them. they also
make a great syrup from tree sap. VOY
"Time and Again" 1-4
Drayan; (left) Civilization of technologically advanced humanoids from the planet Drayan II in the Delta Quadrant. The Drayan life cycle was the reverse of that of many other humanoid species. Drayans are born in an adult state and proceed to grow smaller and more innocent as they get older. Very old Drayans appear as small children. About three generations ago, the culture on Drayan II underwent a reformation in which they shifted their focus away from technology. During this time they also adopted an isolationist attitude toward outside cultures. VOY "Innocence" 2-38
Dream
species. (right) Telepathic humanoid
civilization in the Delta Quadrant. These people lived in a cave and
their consciousness existed only in a dream state. For centuries, the
dream species had suffered attacks from a variety of outsiders they
referred to as the waking species. In order to protect themselves,
the dream species took refuge in underground caverns. They
established an artificial neurogenic field surrounding their planet,
causing intruders from any waking species to fall asleep. Once in the
realm of sleep, the dream species could deal with such intruders on
their own terms. VOY "Waking
Moments" 4-81
Drellians;
Race whose natives refer to the devil as 'Torak.'
TNG "Devil's Due" 4-87
Dremans; (left) Fourth planet in the Benev Selec system in the Selcundi Drema sector, home to a humanoid civilization. Drema IV possesses the largest deposits of dilithium ore ever recorded. This ore is laid down in unusually aligned lattices that converted the planet's geologic heat into mechanical stress, thus resulting in significant tectonic instabilities that nearly destroyed the planet. While the Prime Directive prohibited contact with the inhabitants, humanitarian considerations demanded a means of assistance. The geological instabilities were neutralized by the use of resonator probes launched from orbit. TNG "Pen Pals" 2-41