Lilioceris merdigera is a species of shining leaf beetles belonging to the family Chrysomelidae, subfamily Criocerinae. It is found in the whole Palearctic ecozone. These beetles are 6–8 mm long. Head, pronotum, elytra, femora and tibiae are bright red and elytra bear several rows of dots. It can be easily distinguished by the similar Lilioceris lilii which has black instead of red legs and head. The larvae are typically covered by blackish mucilaginous substances mixed with their own faeces, that seem to have a protective function. The adult beetles can produce chirping sounds.