Movie S3.

Relatively small male attempting to copulate. Female on top, male on bottom. The abdomen of the male is too short for copulation. Dimorphism score = - 561μm.

Rapid experimental evolution of reproductive isolation from a single natural population

Scott M. Villa, Juan C. Altuna, James S. Ruff, Andrew B. Beach, Lane I. Mulvey, Erik J. Poole, Heidi E. Campbell, Kevin P. Johnson, Michael D. Shapiro, Sarah E. Bush, and Dale H. Clayton

PNAS. 2019. 116:13440-13445 DOI: 10.1073/pnas.1901247116