The Arcadians are a spacefaring humanoid alien species with pale skin and long pointed ears. They hail from Arcadia, the fifth planet of the Vellun Gamma system. As of 2286, their homeworld is a member of the United Federation of Planets.
They are an amphibious race which feeds naturally on plankton, but can also complement their nutrition by performing photosynthesis. They live for about 40 to 60 years, and carry their offspring in a marsupial pouch for a few months after birth.
- Star Trek IV: The Voyage Home (1986)
- The name and information about this species originates from the Star Trek IV Sourcebook Update.