Do you know what this is?

Hello to all
I'm a new subscriber of the Gardeners World magazine and the first time in this forum.
Over the last summer, I took some pictures of insects in my garden and was able to identify most of them. But I struggle to find the name of this little one in the picture below. The picture was taken while he or she was sitting on a Rudbeckia petal.
Do you know by chance it's name?
Another funny thing I observed was that something had sawed off the petals of the Leucanthemum May Queen. Just for curiosity, do you know what insects may need them or eat them? I was thinking about buying 2 or 3 more plants this February in case it's useful for certain insects and I wanted to have a regular regrow of the flowers.
Many thanks for each suggestion.

I'm a new subscriber of the Gardeners World magazine and the first time in this forum.
Over the last summer, I took some pictures of insects in my garden and was able to identify most of them. But I struggle to find the name of this little one in the picture below. The picture was taken while he or she was sitting on a Rudbeckia petal.
Do you know by chance it's name?
Another funny thing I observed was that something had sawed off the petals of the Leucanthemum May Queen. Just for curiosity, do you know what insects may need them or eat them? I was thinking about buying 2 or 3 more plants this February in case it's useful for certain insects and I wanted to have a regular regrow of the flowers.
Many thanks for each suggestion.

I ♥ my garden.
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Posts
I don't know what your insect is, but you could try using iSpot ... see link below
https://www.ispotnature.org/communities/uk-and-ireland
This is a really useful resource for identifying the insects that share our gardens.
Regarding your Leucanthemum ... I've also seen flowers that appear to have sawn off leaves, and I think this damage may actually happen at the bud stage .... possibly slugs?
Bee x
A single bee creates just one twelfth of a teaspoon of honey in her lifetime
I ♥ my garden.
I ♥ my garden.
https://www.naturespot.org.uk/species/pea-leaf-weevil
I ♥ my garden.