Functional innovation promotes diversification of form in the evolution of an ultrafast trap-jaw mechanism in ants

Douglas B. Booher, Joshua C. Gibson, Cong Liu, John T. Longino, Brian L. Fisher, Milan Janda, Nitish Narula, Evropi Toulkeridou, Alexander S. Mikheyev, Andrew V. Suarez, Evan P. Economo

Research output: Contribution to journalArticlepeer-review

Abstract

Evolutionary innovations underlie the rise of diversity and complexity—the 2 long-term trends in the history of life. How does natural selection redesign multiple interacting parts to achieve a new emergent function? We investigated the evolution of a biomechanical innovation, the latch-spring mechanism of trap-jaw ants, to address 2 outstanding evolutionary problems: how form and function change in a system during the evolution of new complex traits, and whether such innovations and the diversity they beget are repeatable in time and space. Using a new phylogenetic reconstruction of 470 species, and X-ray microtomography and high-speed videography of representative taxa, we found the trap-jaw mechanism evolved independently 7 to 10 times in a single ant genus (Strumigenys), resulting in the repeated evolution of diverse forms on different continents. The trap mechanism facilitates a 6 to 7 order of magnitude greater mandible acceleration relative to simpler ancestors, currently the fastest recorded acceleration of a resettable animal movement. We found that most morphological diversification occurred after evolution of latch-spring mechanisms, which evolved via minor realignments of mouthpart structures. This finding, whereby incremental changes in form lead to a change of function, followed by large morphological reorganization around the new function, provides a model for understanding the evolution of complex biomechanical traits, as well as insights into why such innovations often happen repeatedly.

Original languageEnglish (US)
Article numbere3001031
JournalPLoS biology
Volume19
Issue number3
DOIs
StatePublished - Mar 2 2021

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)

Fingerprint Dive into the research topics of 'Functional innovation promotes diversification of form in the evolution of an ultrafast trap-jaw mechanism in ants'. Together they form a unique fingerprint.

Cite this