Caryosyntrips ("nutcracker") is an extinct genus of stem-arthropod which known from Canada, United States and Spain during the middle Cambrian.

[4][1][5][6] Caryosyntrips is known only from its 14-segmented frontal appendages, which resemble nutcrackers, with the endite (ventral spine)-bearing margin facing each other, and the bell-shaped bases might represent movable articulations with the animal's head.

[1] Details of the endites, terminal spines, segmental boundaries and outer margins differ between species.

[1] It is thought to have used their frontal appendages in a scissor-like grasping or slicing motion, and were probably durophagous, feeding on hard-shelled organisms.

[1] Other structures remain unknown, although a specimen with paired appendages possibly contain other fragmental head sclerites as well.