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Eurydema oleracea
The rape bug has a shiny, flat dark-coloured body about seven millimetres long and four millimetres wide. There is an oval spot on the top of the mesonotum and one on each of the elytra as well as a longitudinal stripe on the prothorax. In young adults these spots are yellow but change to white or red in older bugs. The colour of the abdomen changes at the same time from buff to black.
It is distributed in the Palearctic ecozone. It overwinters as an adult, emerging in the spring. Consumers of a wide range of cruciferous plants.
Nice adult bug Marta. It seems it is on some type of Brassica oleracea pant. It's always good to get the photo in its habitat as you have done and the ID has an extra level of certainty.