In 2014, Brusatte, Lloyd, Wang and Norell published an analysis on Coelurosauria, based on data from Turner "et al." (2012) who named a third subfamily of troodontids, Jinfengopteryginae. Their analysis included more basal troodontid species but failed to resolve many of their interrelationships, resulting in large "polytomies" (sets of species where the branching order in the family tree is uncertain). An updated version of the Brusatte "et al." analysis was provided by Shen "et at." (2017b), who included more taxa and recovered greater resolution. Shen "et at." named a fourth subfamily of troodontids, the Sinovenatorinae. A simplified version of their analysis is shown below.