New Publication: Parallel Saltational Evolution of Ultrafast Movements in Snapping Shrimp Claws

3D digital reconstructions of the musculature and joint mechanism in shrimp snapping claws; diceCT models alongside confocal imaging, high-speed video, and kinematic experiments helped to elucidate how the extreme performance of crustacean claws came about.

“Does dramatic functional change depend on dramatic morphological change? Kaji et al. used contrast-enhanced micro-CT and confocal imaging, high-speed video, and kinematic experiments with select 3D-printed models, to reconstruct the evolutionary changes in form and function that yielded spectacular snapping claws from simple pinching claws in two shrimp families.  They discovered that two novel claw-joint types — a slip joint and a torque-reversal joint — preceded the evolution of snapping.  They also found that the evolutionary transitions slip joint ➔ torque-reversal joint ➔ snapping occurred in both shrimp families studied.  These results show how subtle changes in joint-form yielded dramatic changes in claw function (e.g., closing speed) during the evolution of snapping claws.”

– Lead author, Tomonari Kaji (@)

See more of Dr. Kaji’s research online and head over to Current Biology to read the pub!

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