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The compound eye of Leptodora kindtii (Cladocera): : An adaptation to planctonic life.

Nilsson, Dan-E LU ; Odselius, Rolf and Elofsson, Rolf LU (1983) In Cell and Tissue Research 230. p.40-410
Abstract
Each of the approximately 500 ommatidia in the compound eye of the cladoceran crustacean Leptodora kindtii has a crystalline cone consisting of five cells. Five retinula cells are also present, one of which contributes to the distal 1–2 μm of the rhabdom only; the other four retinula cells form a continuous rhabdom. Throughout the rhabdom its cross section displays two separate halves with the axis of the microvilli in one half perpendicular to that in the other (orthogonal pattern). Interferometric analysis of the refractive index of the crystalline cone revealed an inhomogeneous system with one distal and one proximal gradient. The gradient system was found to exclude rays entering from adjacent facets, thus maintaining the optical... (More)
Each of the approximately 500 ommatidia in the compound eye of the cladoceran crustacean Leptodora kindtii has a crystalline cone consisting of five cells. Five retinula cells are also present, one of which contributes to the distal 1–2 μm of the rhabdom only; the other four retinula cells form a continuous rhabdom. Throughout the rhabdom its cross section displays two separate halves with the axis of the microvilli in one half perpendicular to that in the other (orthogonal pattern). Interferometric analysis of the refractive index of the crystalline cone revealed an inhomogeneous system with one distal and one proximal gradient. The gradient system was found to exclude rays entering from adjacent facets, thus maintaining the optical isolation. Consequently, these optics replace distal screening pigment, which is absent in the eye. The long and unscreened crystalline cones give rise to an almost transparent eye in conformity with the overall transparency of this planktonic animal.

The morphological characteristics of the eye of this species deviate from other cladoceran eyes, but the optical design closely resembles that of some pelagic marine amphipod crustaceans. (Less)
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organization
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Contribution to journal
publication status
published
subject
keywords
Optics, Fine structure , Cladocera
in
Cell and Tissue Research
volume
230
pages
40 - 410
publisher
Springer
ISSN
1432-0878
DOI
10.1007/BF00213813
language
English
LU publication?
yes
id
67ce5bc0-954f-4341-b862-ae7a1de6618e
date added to LUP
2016-11-27 16:49:19
date last changed
2016-12-08 14:37:47
@article{67ce5bc0-954f-4341-b862-ae7a1de6618e,
  abstract     = {Each of the approximately 500 ommatidia in the compound eye of the cladoceran crustacean Leptodora kindtii has a crystalline cone consisting of five cells. Five retinula cells are also present, one of which contributes to the distal 1–2 μm of the rhabdom only; the other four retinula cells form a continuous rhabdom. Throughout the rhabdom its cross section displays two separate halves with the axis of the microvilli in one half perpendicular to that in the other (orthogonal pattern). Interferometric analysis of the refractive index of the crystalline cone revealed an inhomogeneous system with one distal and one proximal gradient. The gradient system was found to exclude rays entering from adjacent facets, thus maintaining the optical isolation. Consequently, these optics replace distal screening pigment, which is absent in the eye. The long and unscreened crystalline cones give rise to an almost transparent eye in conformity with the overall transparency of this planktonic animal.<br/><br/>The morphological characteristics of the eye of this species deviate from other cladoceran eyes, but the optical design closely resembles that of some pelagic marine amphipod crustaceans.},
  author       = {Nilsson, Dan-E and Odselius, Rolf and Elofsson, Rolf},
  issn         = {1432-0878},
  keyword      = {Optics,Fine structure ,Cladocera},
  language     = {eng},
  pages        = {40--410},
  publisher    = {Springer},
  series       = {Cell and Tissue Research},
  title        = {The compound eye of Leptodora kindtii (Cladocera): : An adaptation to planctonic life.},
  url          = {http://dx.doi.org/10.1007/BF00213813},
  volume       = {230},
  year         = {1983},
}