Gall for ID, please

Gall for ID, please

Observation - Gall for ID, please. Description: Another gall on a buttercup. I'm not sure if this is an insect or fungal gall: I'll go with insect for the moment. Can anyone suggest an ID, please?

Another gall on a buttercup. I'm not sure if this is an insect or fungal gall: I'll go with insect for the moment. Can anyone suggest an ID, please?