| Date | Grid | Clue | Author | Editor |
|---|---|---|---|---|
| Sun, Feb 26, 2012 | 16D | Early life forms? | Daniel A. Finan | Shortz |
| Fri, Mar 06, 2009 | 42D | Early developments | Corey Rubin | Shortz |
| Sun, Jan 05, 2003 | 92D | Biologists' study | Elizabeth C. Gorski | Shortz |
| Sat, Apr 15, 1995 | 1A | Rudimentary stages | Bob Klahn | Shortz |