In myrmecology, a solarium is an above-ground earthen structure constructed by some ant species for the purpose of nest thermoregulation and brood incubation.[1] Solaria are usually dome-shaped and fashioned from a paper-thin layer of soil, connected to the main nest by way of subterranean runs. Some species, such as Formica candida, construct solaria using plant materials.[2]
Tapinoma erraticum is an example of a solaria-constructing species whose skill at so doing was noted by Horace Donisthorpe in the early 20th century in his book British Ants, their Life Histories and Classification.[3]