A nymph of the Dock bug (Coreus marginatus) [1] on Great burnet (Sanguisorba officinalis).
The plant is not a host or food plant for the species [2], however individuals or pairs can often be found on it, see also this post.
This nymfph is a 5th instar which can be seen from the underdeveloped wings that reach to about the 3rd abdominal segment [3,4,5].
Literature
1 Nederlands Soortenregister2 Pekár, S., & Hrušková, M. (2006). How granivorous Coreus marginatus (Heteroptera: Coreidae) recognises its food. acta ethologica, 9(1), 26-30.
3 Barao, Kim & Mostardeiro, Kayan & Matesco, Viviana & Cohen, Anne & Grazia, Jocelia. (2015). Morphology of the Nymphs of Euschistus convergens (Hemiptera: Pentatomidae). Florida Entomologist. 98. 1163-1168. 10.1653/024.098.0421.
4 Matesco, Viviana & Schwertner, Cristiano & Grazia, Jocelia. (2009). Morphology of the Immatures and Biology of Chinavia longicorialis (Breddin) (Hemiptera: Pentatomidae). Neotropical entomology. 38. 820-8. 10.1590/S1519-566X2009000100007.
5 Fürstenau, Brenda & Schwertner, Cristiano & Grazia, Jocelia. (2013). Comparative morphology of immature stages of four species of Chinavia (Hemiptera, Pentatomidae), with a key to the species of Rio Grande do Sul, Brazil. ZooKeys. 319. 59-82. 10.3897/zookeys.319.4310.
