crystalline tract

crystalline tract
(ARTHROPODA: Insecta)
1. In beetles with exocone eyes, a strand formed by the Semper cells across the clear zone to the rhabdon.
2. In skipper butterflies and some ditrysian moths (Bombycoidea), a strand formed by the retinula cells.

Online Dictionary of Invertebrate Zoology. . 2005.

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