Estlandia
Estlandia is a gonambonitid genus. It is one of the endemic brachiopods in the Ordovician of Baltoscandia. Currently, eight different species and subspecies of the genus have been recorded from the Aseri to Keila stages. The distribution of the genus "Estlandia" is confined to the Middle and Upper Ordovician of the North Estonian Confacies Belt and the northwestern part of the Moscow Basin. The first notes on "Estlandia" date back to 1840. The genus name was first published in 1931.