The Deltans were a humanoid species originating from the Federation planet Delta IV.

Deltans were identified by their bald scalps and were known to wear head dresses. Their strong sexual attraction could be a distraction for members of other species, which is why Deltans swore an oath of celibacy upon entering service in Starfleet. (ENT: "Bound"; Star Trek: The Motion Picture; Star Trek IV: The Voyage Home) While Deltans had pain-relieving abilities that manifested during tactile contact, this ability did not heal injuries.

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