The following is a chronological list of unnamed Arcadians.
USS Enterprise crewman[]
In the year 2273, at least one Arcadian of unspecified gender served aboard the USS Enterprise. (TOS novel: Ex Machina)
Federation Council[]
In 2286, two Arcadians were present among the Federation Council during the Cetacean probe crisis on Earth and Admiral James T. Kirk's subsequent disciplinary hearing. (TOS movie: The Voyage Home)
USS Billings officer[]
In the 2360s, a female Arcadian served as science officer aboard the USS Billings. The ensign was part of the away team making official first contact between the Federation and the Adegeda of Arali Prime. (ST - Waypoint comic: "The Swift Spoke")
Cetacean Institute staff[]
In September 2385, an Arcadian was working at the Cetacean Institute in Sausalito, California, on Earth. (The Fall novel: The Poisoned Chalice)
Nog's encounter[]
In November 2385, an Arcadian had an encounter with Nog. This individual was considered little by Arcadian standards. (DS9 novel: Force and Motion)
Bar patron[]
In late-2385, a tiny female Arcadian was a regular at Fred's bar on the refueling station in orbit of Enterol VI. While Morn was a patron at the bar, she enjoyed listening to the tales of his adventures while sitting on his lap. She was concerned about Morn following his reaction to the news that the Sacred Scroll of the Rules of Acquisition was a fake. She worked as a subspace frequency analyst. (DS9 eBook: Rules of Accusation)