The structure of the double-eyes of Baetis and the uniform eyes of Ecdyonurus (Ephemeroptera)

  title={The structure of the double-eyes of Baetis and the uniform eyes of Ecdyonurus (Ephemeroptera)},
  author={Frank Burghause},
SummaryThe lateral eyes of Baetis vernus are structured similarly in both sexes. They are eucone apposition eyes with a closed rhabdom formed by eight retinula cells. The accessory pigment cells surround the ommatidia over their entire length. The morphological adaptation to different illuminations consists of a radial displacement of mitochondria and endoplasmic vacuoles. The dorsal eyes of the male Baetis, often called turban eyes, differ remarkably in structure and size from the lateral… 
Post-embryonic development of the lateral eye of Cloeon sp . ( Ephe-meroptera : Baetidae ) as revealed by scanning electron microscopy
The intriguing idea is presented that females might choose males with the largest dorsal eyes as they prepare to leave the water and the different roles of the lateral eyes in male and female baetid mayflies is discussed in relation to their flights.
University of Groningen Evolution of color and vision of butterflies Stavenga , Doekele ; Arikawa , Kentaro
The corneal nipple array and the tapetum, optical structures that many but not all butterflies share with moths, suggest that moths are ancestral to butterflies, in agreement with molecular phylogeny.
Microtomographic study on the anatomy of adult male eyes of two mayfly species
It is postulated that differences in the diameter sizes of the ommatidia, when comparing dorso-frontal and ventro-lateral parts of the compounds eyes, represent an evolutionary advantage enabling increased accuracy in movement displacement detection of competing males within the swarm.
Evolution of color and vision of butterflies.


The dorsal eye of the mayfly Atalophlebia (Ephemeroptera)
  • G. Horridge, M. McLean
  • Biology
    Proceedings of the Royal Society of London. Series B. Biological Sciences
  • 1978
The dorsal eye of Atalophlebia has two unusual features, the sensitivity only to ultraviolet (u. v.) light, and the candelabra-shaped rhabdom, which indicates that a superposition image cannot be formed by u. v. light.
Die Struktur des Rhabdoms im „Doppelauge“ des Wasserläufers Gerris lacustris
SummaryThe structure of the rhabdome in the compound eye of Gerris lacustris is investigated electron microscopically. After fixation in osmium tetroxide and embedding in Vestopal the material was
The ommatidium of the dorsal eye of Cloeon as a specialization for photoreisomerization
  • G. Horridge
  • Biology
    Proceedings of the Royal Society of London. Series B. Biological Sciences
  • 1976
The turbanate dorsal eyes of Cloeon have thin biconvex corneal facets, large crystalline cones, and long retinula cells which cross the clear zone, which suggests that the eye operates with high visual acuity because the cornea is focused on the tip of the cone, which means the eye could function near the diffraction limit.
The superposition eye of Cloeon dipterum: The organization of the lamina ganglionaris
The lamina ganglionaris of the superposition eye of Cloeon dipterum is composed of separate optic cartridges arranged in a hexagonal pattern and synaptic contacts could be seen between a presynaptic retinula cell and more than two other postsynaptic profiles which belong to monopolar cells or sometimes to glial cells.
Circadiane Adaptation und Schirmpigmentverlagerung in den Sehzellen der Medianaugen vonAndroctonus australis L. (Buthidae, Scorpiones)
Pigment migration in the retinula cells is the most important mechanism involved in the circadian sensitivity change, which proves that the periodical adaptation is a self-sustained circadian rhythm.
Notizen: The Dorsal Eye of Cloeon dipterum (Ephemeroplera) (A Light- and Electronm icroscopical Study)
The superposition eye of Cloeon dipterum is a clear zone type of compound eye that has two rhabdomes, at different levels, a small apical and a main basal one that is greater than the number of dioptric apparatuses.
Massive diurnally modulated photoreceptor membrane turnover in crab light and dark adaptation
Direct effects of light and dark on synthesis and degradation of photoreceptor membrane must therefore be superimposed on indirect or direct cyclic neuroendocrine control presumably coupled to an entrained circadian oscillator.
Photoregeneration and the Adaptation Process in Insect Photoreceptors
This work has shown that in both human and rat eyes, an approximately linear relationship between log sensitivity and rhodopsin concentration was found, and that the sensitivity is greatly decreased, but the probability of quantal absorption is only slightly reduced.
Embedding in epoxy resins for ultrathin sectioning in electron microscopy.
More rapid than previous techniques, this method gives blocks which do not fracture unduly on trimming and provides sections of soft tissues at 1 μ for phase contrast microscopy, as well as ultrathin sections which cut as easily with glass knives as sections of methacrylate.