Graellsia isabellae, the Spanish moon moth, is in the silkmoth family Saturniidae.

There is a small representation in some places located in France and Switzerland where they are not native but instead further generations of captive moths through repopulation attributed to human action with specimens from Spain.

They are relics originating from the Ice age or beyond as It is thought that their habitat is a refuge location.

After copulation the female lays about 100 to 150 eggs on the favoured food plant, pines.

It appears to have difficulty adopting to non-native pine species as a host even within the genus Pinus .