Ariamnes waikula is a species of spider from the Theridiidae family. The species is known only from the island of Hawaii, in the state of Hawaii. The type specimen was collected from wet forest habitat at 1,067 meters (3,501 ft) elevation. The species is named for its gold-colored abdomen using the Hawaiian word for gold-colored, "waikula." A scientific description of this species was first published in 2007 by Gillespie & Rivera.