Flowchart of data acquisition.

We identified a total of articles exploring temporal variation in rates of lineage diversification. Data for of these studies were archived in online repositories; data for the remaining studies were solicited by direct requests to the corresponding author by an undergraduate student ( studies), a graduate student (), or a professor (). A maximum of three requests were made at weekly intervals. Recovered phylogenetic data comprised tree files (green), alignment files (orange), or both (blue). Datasets not obtained after the third request were deemed unavailable (gray).