Tortoise Beetle

Tortoise Beetle

Observation - Tortoise Beetle - UK and Ireland. Description: Limpet-like shallow-domed insect. Yellowish-green compared to the bramble leaf it was on. I thought

Limpet-like shallow-domed insect. Yellowish-green compared to the bramble leaf it was on.
I thought this was an old elm seedcase at first glance but realised it must be a Cassida of some sort.
No signs of movement - and I was not going to poke a finger at it, so no sight of antennae or legs