Argalista kingi is an extinct species of sea snail, a marine gastropod mollusc in the family Colloniidae. Fossils of the species date to the early Pleistocene strata of the Castlepoint Formation at Castlepoint, Wairarapa, New Zealand.
In the original description, Powell described the species as follows:
The holotype of the species has a height of , and a diameter of . It is similar in appearance to Eutinochilus impervius, but can be identified due to A. kingi being more tightly coiled, its adult size being significantly smaller, and by having more of an umbilical depression.
The species was first described by A.W.B. Powell in 1938. The holotype was collected from the Lighthouse Reef, Castlepoint, Wairarapa, New Zealand in 1924, and is held by the Auckland War Memorial Museum.
This extinct marine species occurs in early Pleistocene (Nukumaruan stage) strata of the Castlepoint Formation at Castlepoint, Wairarapa, New Zealand, dating to c. 2.40 million years ago. It is only rarely found at its type locality.