Most species were found to nest in twigs on trees and to forage on low vegetation.

R. opaca was described from four specimens found on Romblon Island, Philippines, by Wheeler (1935).

[4] However, the species had already been described by F. Smith in 1861 as Myrmica opaca, which had been collected at Tondano, Sulawesi by Alfred Russel Wallace.

[2] Romblonella is found from the Philippines south through New Guinea, with one species known from Australia.

[citation needed] The genus is named after the locality where the type species was found.