From ZooTerms (Dictionary of Invertebrate Zoology)
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corniculus (noun; plural corniculi; Latin diminutive cornu, horn): 1. (Arthropoda: Chelicerata) In some mites, a horn-shaped infracapitular seta on the malapophysis.

2. (Arthropoda: Insecta) In Orthoptera, refers to the hardened tips of the dorsal and ventral valves of the ovipositer, used to dig holes in the ground for the deposition of eggs

See also: urogomphi.