Cepphis advenaria, the little thorn, is a moth of the family Geometridae. The species can be found in Europe. The wingspan is 23–26 mm. The length of the forewings is 14–17 mm.The ground colour is usually whitish, freckled and clouded with grey brown. The cross lines are slightly darker. The markings may be tinged with ochreous, or with red. On the rear wing is a dark dot.See also the genus description (references - Watson, L., and Dallwitz, M.J. 2003). The larvae feed mainly on bilberry.