Brimstone caterpillar?

      Brimstone caterpillar?

Observation - Brimstone caterpillar? . Description: Found on buckthorn leaves. Less than 1 cm long - there were several like this. Can you tell whether it is a Brimstone caterpillar from this? Not many features to go on. (Wild seedling buckthorn that was preserved in the hope of encouraging Brimstones.

Found on buckthorn leaves. Less than 1 cm long - there were several like this. Can you tell whether it is a Brimstone caterpillar from this? Not many features to go on. (Wild seedling buckthorn that was preserved in the hope of encouraging Brimstones.)