Johnston Atoll is a territory
of the United States of America and is protected as a
national wildlife refuge (fws.gov). It is part of the Central Polynesian Tropical Moist Forests ecoregion (EoE). Reviews of the natural history of the atoll are at (Bishop Museum pdf file) and (Smithsonian pdf file).
Nahacky’s Angelfish Centropyge nahackyi (FishBase) is a coral reef fish that breeds exclusively at Johnston Atoll.
Parasterope pacifica and Bruuniella beta (both at Pacific Science) are two recently described ostracod crustaceans known only from Johnston Atoll.