Megalomys luciae, also known as the Saint Lucia pilorie or Saint Lucia giant rice rat, Forsyth Major stated that he believed the specimen he was examining to be the same one that was mentioned being added to a collection in a 13 November 1849 entry in the Proceedings of the Zoological Society of London, then documented as the Mus (Hesperomys) pilorides (considered a synonym of Megalomys desmarestii). Édouard Louis Trouessart moved the species from Oryzomys to Megalomys in 1904.