An export of data from the Hesperomys Project version 23.8.1. The Hesperomys Project is a database of taxonomy and nomenclature, focused on mammals but also covering some other groups, principally other fossil tetrapods. The database contains information such as: Taxonomic classification for all mammals, living and extinct References to original citations for the vast majority of names Type specimens and type localities for numerous names The full database is available online at hesperomys.com. This export contains: name.csv: Data on names, including taxonomic context, authority, citation, type locality, type specimen, and classification of the etymology. taxon.csv: Data on taxa, including classification and authority collection.csv: Data on collections that contain type specimens, including name, location, and number of type specimens in the database The code used to generate the exports is on GitHub. Release notes for version 23.8.1: Database Add numerous additional links to type specimen catalog entries, primarily for US collections found in VertNet. About 37% of names in the database with type specimens now have a link to an online collection database. Add and update some additional type specimens. Backend Add support for "extra" and "future" catalog numbers on type specimens. Require that type specimen links from a particular collection follow a fixed prefix Support marking fields on tags as required or not. Fixes a bug where some name pages (those that have lectotype/neotype designations for which no source has been recorded) failed to render. Frontend Add total counts to all lists.