Incident sunlight reflecting a concentrated bright shimmer pulled my attention to an object floating in water. A small chalcid wasp, ±4 mm in length, floated submerged in water. It turned out to be a female Perilampus aeneus [1,2], a parasite on Curculionidae (Coleoptera), Tenthredinidae (Hymenoptera), Tortricidae (Lepidoptera) [2] and Tachinidae (Diptera), Blepharipa pratensis and Parasetigena silvestris [3].


During examination with a magnifying glass it became clear she wasn’t dead yet but not much life was left in her. Shortly after she passed away and is now part of garden collection.

Literature
1 Nederlands Soortenregister2 MITROIU, Mircea-Dan; KOUTSOUKOS, Evangelos. Perilampus neglectus and other neglected species: new records of Palaearctic Perilampidae (Hymenoptera, Chalcidoidea), with a key to European species of Perilampus. Journal of Hymenoptera Research, 2023, 96: 57-99.
3 ZANKL, Thomas; SCHAFELLNER, Christa; HOCH, Gernot. Parasitoids and pathogens in a collapsing Lymantria dispar (Lepidoptera: Erebidae) population in Lower Austria. Journal of Applied Entomology, 2023.