Malacodea regelaria is a moth of the Geometridae family and only species in the Malacodea genus. It is found from Fennoscandia and Estonia to northern Siberia. The wingspan is 25–31 mm for males. Females are wingless. Adults are on wing from April to May in one generation per year. The larvae feed on Picea abies. Larvae can be found in July. The species overwinters as a pupa.