"The discovery of a new ssp. of Thera firmata in the French Eastern Pyrenees questions the exact status of ulicata which does not appear to be a species on its own." . "Mazel, R. 1998. Thera firmata tavoilloti ssp. nova et Thera firmata ulicata (Rambur, 1834) bona species (Lepidoptera Geometridae). Linneana Belgica, XVI(6): 253-258." . . "The discovery of a new ssp. of Thera firmata in the French Eastern Pyrenees questions the exact status of ulicata which does not appear to be a species on its own." . . "Mazel (1998)" . "1998"^^ . "Mazel (1998)" . "1998"^^ . .