Snap-jaw morphology.

Snap-jaw morphology is specialized for high-speed power amplification in the Dracula ant, Mystrium camillae.
Fredrick J. Larabee, Adrian A. Smith and Andrew V. Suarez.

https://royalsocietypublishing.org/doi/10.1098/rsos.181447 or https://royalsocietypublishing…i/pdf/10.1098/rsos.181447
and
https://figshare.com/collectio…trium_camillae_i_/4310744
and
https://royalsocietypublishing…suppl/10.1098/rsos.181447

Read this in a dayly newspaper "Metro" on mo. 28 january 2019, p. 8, "mustread":

Another example: