D
Deltan    Deneva Parasites    Denovians    Dopterian    Dosi
DELTAN
Federation Member
Description Humanoid, Bipedal
Size Medium
Skin Pigment White (pale)
Hair None (except for eyebrows & eyelashes)
Distinguishing Features
Series ST I: TMP
Planet of Origin Delta IV
Quadrant Alpha
Background Deltans generally live in group/line families and are intimately attuned to each other and the psychological whole.  This leads to having an empathic dependency, so that Deltans serving on a mixed crew ship always want at least one other Deltan on board.  If this number is larger, they prefer to be quartered together, commonly in modified quarters either connected or communal in nature.  Deltans also have a pheromone control system in their bodies which allows them to produce pheromonal chemicals naturally.  It is assumed that this system is used during normal courtship rituals between Deltans, but they can also control other pheromones besides the erotic-enhancing ones.  Among the pheromonal abilities of a trained Deltan is the ability to produce a pheromonal chemical which seems to reduce pain in most humanoid races. Deltans generally produce the pheromone associated with sexual arousal on a day-to-day basis.  They are usually considered very attractive physically as well. This makes for bad psychological effects on members of a mixed crew ship. Generally, Deltans do not serve on mixed crew vessels in Starfleet. Those that do take the Oath of Celibacy so as to not take advantage of any sexually immature species.  Their Oath of Celibacy only applies to species considered by them to be sexually immature (which currently includes Terrans).  Deltans serving with mixed race crews often chemically alter their pheromones with a special chemical application.
Editors Notes The Deltans exhibit the most advanced sexuality of any Federation race, requiring them to take oaths of celibacy before serving on Starfleet Vessels.  This is meant to prevent any unfortunate incidents while on board any Starship.  They also exhibit telepathic abilities as a "mind-meld anesthesia" in which they absorb and share the pain felt by injured patients.  As well as being highly developed sexually, they are also highly developed socially.  Deltans tend to be open and gregarious by nature, and tend to be Sensualists. This can also account for their proclivity towards consensus and cooperation and being team players. They make excellent teachers, athletes, scientists, engineers, Counselors, Helm/Navigation officers, and system specialists. 
Due to their overall good nature, they will wish to avoid conflicts unless they see them in a constructive sense. Deltans can and will defend themselves excellently with either bare hands or weapons. They enjoy most sporting forms of combat, but do not make good Security officers.

DENEVA PARASITES
Description Amoebic/Parasitic
Size Small
Skin Pigment Red/Brown
Hair None Evident
Distinguishing Features
Series TOS: "?"
Planet of Origin
Quadrant Alpha (assumed)
Background Attacked Spock the 1st officer of the USS Enterprise during and away mission.  The parasite was eventually killed by intense light.
Editors Notes
 
Some Information provided by the Lost Races of TOS.

DENOVIANS
 
Description Humanoid, Bipedal
Size Medium
Skin Pigment Varies
Hair Varies
Distinguishing Features Indistinguishable from Terrans.
Series
Planet of Origin Denova III
Quadrant Alpha (border)
Background Denova 3 has only had warp drive for less than 150 years and on the Richter Scale of Cultural Development, Denova 3 would be classified as being a J culture, the Expansion Age.
Editors Notes The Denova system is located in the Alpha Quadrant, near the edge of Federation explored space.  Denova has not joined the Federation, however, wanting to keep their autonomy for the time being. 

DOPTERIAN
Description Humanoid, Bipedal
Size Medium
Skin Pigment Tan
Hair None evident
Distinguishing Features Enlarged head with spots/markings prominant.
Series DS9: "The Forsaken"
Planet of Origin
Quadrant Alpha
Background Close relative of the Ferengi race.
Editors Notes Possess the same 4 lobe brain structure that makes telepathic reading difficult if not impossible. 

DOSI
Dominion Member
Description Humanoid, Bipedal
Size Medium
Skin Pigment Tan
Hair
Distinguishing Features Face has red decorative markings highlighted by white lines and blue spots.
Series DS9: "Rules of Acquisition"
Planet of Origin
Quadrant Gamma
Background
Editors Notes Probable Dominion Member.