I developed this checklist after discussions in 2014 on the community forum. It remains a work in progress and I update it every 6-12 months. The checklist started life based on the IUCN’s Red List but is now much more closely aligned with the American Society of Mammalogists’ Mammal Diversity Database (MDD) because this database is more current than the IUCN Red List.
My list differs from the the MDD occasionally. I include a few ‘new’ species that I believe are in the pipeline even if they have not been formally described. I also ignore a few MDD lumps and splits that are still tentative and might be undone. The taxonomic order largely follows Wilson & Reeder’s Mammals of the World (2005, Johns Hopkins University Press).
The spreadsheet also lists changes made over time since I started it.