PT  - JOURNAL ARTICLE
AU  - Feller, Kathryn D.
AU  - Sutton, Gregory P.
AU  - Gonzalez-Bellido, Paloma T.
TI  - Medium compensation in a spring-actuated system
AID  - 10.1242/jeb.208678
DP  - 2020 Feb 15
TA  - The Journal of Experimental Biology
PG  - jeb208678
VI  - 223
IP  - 4
4099  - http://jeb.biologists.org/content/223/4/jeb208678.short
4100  - http://jeb.biologists.org/content/223/4/jeb208678.full
SO  - J. Exp. Biol.2020 Feb 15; 223
AB  - Mantis shrimp strikes are one of the fastest animal movements, despite their occurrence in a water medium with viscous drag. Since the strike is produced by a latch-mediated spring-actuated system and not directly driven by muscle action, we predicted that strikes performed in air would be faster than underwater as a result of reduction in the medium's drag. Using high-speed video analysis of stereotyped strikes elicited from Squilla mantis, we found the exact opposite: strikes are much slower and less powerful in air than in water. S. mantis strikes in air have a similar mass and performance to latch-mediated spring-actuated jumps in locusts, suggesting a potential threshold for the energetics of a 1–2 g limb rotating in air. Drag forces induced by the media may be a key feature in the evolution of mantis shrimp strikes and provide a potential target for probing the braking system of these extremely fast movements.