This project undertakes a comparative study of the D-layer in six Finno-Ugric languages and pursues two major goals. First, it aims at providing a cartographic representation along with a semantic model for the D-layer in the six languages. Second, it will propose an account of the variation in the properties of the morphemes associated with the D-layer across FU languages. Along with these analytical objectives, an additional empirical contribution of the project will be the creation of a standardized database of patterns of the D-level morphemes in the six languages as well as the creation of a syntactically annotated corpus for one of the most endangered FU languages, Khanty. At the end of the project, both will be made available to the research community.