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- Publisher
- Springer Journals
- Copyright
- Copyright © 1986 by Springer-Verlag
- Subject
- Life Sciences; Cell Biology; Plant Sciences; Zoology
- ISSN
- 0033-183X
- eISSN
- 1615-6102
- DOI
- 10.1007/BF01277048
- Publisher site
- See Article on Publisher Site
Abstract
Three dorsal ocelli are present inCaenis robusta (Ephemeroptera), Trichostegia minor, Agrypnia varia, andLimnephilus flavicornis (Trichoptera). The dioptric apparatus of the ocelli differs between the four species. InTrichostegia andAgrypnia a biconvex corneal lens is present, inLimnephilus the corneal lens is convexo-concave complemented by an underlying haemocoelic space, whereas a cellular vitreous body is found between the cuticle and the retinal layer in the ephemerid. In the three trichopteroid species the ocelli are surrounded by an array of longitudinally arranged tracheoles; inCaenis a layer of screening pigments is found in this position. In this species the rhabdoms formed by microvilli of neighbouring retinula cells have a randomly arranged meshwork pattern; in the three trichopteroid species the rhabdoms are isolated, built up of four retinula cells. Cells with basally situated nuclei and lamellar extensions between the retinular cells are found in the ocelli ofTrichostegia, Agrypnia, andLimnephilus.
Journal
Protoplasma – Springer Journals
Published: Feb 22, 2005