Abstract This study investigates diachronic changes in constructional networks illustrated with examples from the Manchuric branch of Tungusic, an endangered language family spoken in Northeast Asia. Earlier studies have noted pronounced differences between this branch and the rest of the family, such as a reduction in morphological complexity and partial restructuring of the morphosyntactic system. Based on the framework of Diachronic Construction Grammar, this study investigates aspects of nominal morphology, including flagging and indexing. These are especially promising for a better understanding of the evolution of Manchuric and have not often been discussed in terms of Construction Grammar.