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Underwater caterpillar
I saw this caterpillar in my mini-pond today, it is alive and has been moving around! Does anyone know what type it is and whether it will damage my pond plants? Happy for it to stay if it's not a pest.

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In the sticks near Peterborough
From the moth site..
"Most truly aquatic caterpillars belong to a group known as snout moths because of the shape of their mouthparts. They constitute a single family, Crambidae, although some taxonomists do not make so neat a distinction, breaking down the classification into various subgroups. It matters not to the caterpillars.
Aquatic caterpillars stay almost entirely on their food plants or graze on algae-covered rocks and other objects. Some damage plants such as water lilies but also attack noxious invasives such as hydrilla."
I did catch quite a few snout moths last summer, I had no idea there were aquatic caterpillars. I also had one night when I had hundreds of water veneers, tiny micromoths similar to flies in size, they also have aquatic caterpillars.
https://ukmoths.org.uk/species/acentria-ephemerella/