Found on Conium maculatum, or poison hemlock
On a stem coming out of the water
Note the green of the neck, like this one: https://www.inaturalist.org/observations/153624592
Taille environ 6mm, conservé dans l'alcool à 70°, Coléoptère aquatique
Under water, 2 ex, interacting
Male and female I'd say
Light. On the border of steppe and salt marsh. Near a body of water