Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 241the cornea, normally consisting of two cells in each ommatidium;when absent, the cornea is secreted by thecrystalline cone cells. see cornea.corneal facet One of the lenses of modified cuticle covering anommatidium or the array of lenses that gives a compoundeye its faceted appearance.corneal lens (ARTHRO: Insecta) The modified cuticle coveringthe ocellus.corneal pigment cells (ARTHRO) The two corneal cells thatenvelop each crystalline cone of a compound eye; in thedeveloping eye, distal to the cone they secrete the corneallense; also called primary pigment cells, corneagenouspigment cells and primary iris cells. see retinular pigmentcell, accessory pigment cell.cornein n. [L. corneus, of horn] (CNID) The organic basis ofcorals.corneous a. [L. corneus, of horn] Resembling horn; of hornliketexture; corniform.cornicle n. [L. dim. cornu, horn] (ARTHRO: Insecta) In aphids,one of a pair of movable, flap covered, pre-caudal tubesprojecting from the dorsum of segment 6, that expellslipid-filled cells; thought to be a defense mechanism.corniculate a. [L. dim. cornu, horn] Having horns or smallhorn-like structures.corniculum n.; pl. -ula [L. dim. cornu, horn] (ARTHRO: Insecta)A small horn-like process of the cuticula of larvae,often present on the suranal plate.corniculus n.; pl. -uli [L. dim. cornu, horn] 1. (ARTHRO: Chelicerata)In some mites, a horn-shaped infracapitular seta onthe malapophysis. 2. (ARTHRO: Insecta) In Orthoptera, refersto the hardened tips of the dorsal and ventral valves ofthe ovipositer, used to dig holes in the ground for thedeposition of eggs. see urogomphi.cornification n. [L. dim. cornu, horn; facere, to make] Formationof horn or horn-like material; keratinization.corniform a. [L. cornu, horn; forma, shape] A long mucronateor pointed process similar to the horn of an ox.