- Defining the indefinable: can heuristics bypass the species problem? – by Tom Wells (December 2021)
- Systematics and Parsimony – by Andrew Brower (August 2020)
In memoriam
- Sherwin Carlquist (1930-2021) — by Scott Zona (February 2022)
- Normal Platnick (1951-2020) — by David Williams and Greg Edgecombe (August 2020)
- Terry Lee Erwin (1940-2020) — by Beulah Garner (August 2020)
- Jon Tennant (1988-2020) – By Nick Crumpton (July 2020)