ULTRASTRUCTURE OF COMPOUND EYE IN THE LARVAL STAGES OF PENAEUS CHINENSIS

Ultrastructure of compound eye was investigated by TEM and SEM in the larval stages of Penaeus chinensis .The result indicated :The compound eye is in photoreceptive rudiment at Z1 stage .During Z2 stage , the main components of every ommatidium of compound eye were completed .The surface of ommatidium had the appearance of hexagonal facetting before post-larval stage .But the facet was square when the length is 0 .7 ～ 0 .8cm at post-larval stage .Some main organelles of corneagenous cell , such as mitochondia , rough endoplasmic reticulum, etc .decreased gradually .Crystalline tract secreted by crystalline cells began at Z2 stage and became thick gradually .Iris pigmental cells didn' t produce pigmental granules before the post-larval stage .Retina pigments slight increased gradually as developing .The rhabdom was formed at Z2 stage and lengthened gradually .