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A simple visual system without neurons in jellyfish larvae

Nordström, Karin LU ; Wallén, Rita LU ; Seymour, Jamie and Nilsson, Dan-E LU (2003) In Royal Society of London. Proceedings B. Biological Sciences 270(1531). p.2349-2354
Abstract
Earlier detailed studies of cnidarian planula larvae have revealed a simple nervous system but no eyes or identifiable light sensing structures. Here, we describe the planula of a box jellyfish, Tripedalia cystophora, and report that these larvae have an extremely simple organization with no nervous system at all. Their only advanced feature is the presence of 10-15 pigment-cup ocelli, evenly spaced across the posterior half of the larval ectoderm. The ocelli are single cell structures containing a cup of screening pigment filled with presumably photosensory microvilli. These rhabdomeric photoreceptors have no neural connections to any other cells, but each has a well-developed motor-cilium, appearing to be the only means by which light... (More)
Earlier detailed studies of cnidarian planula larvae have revealed a simple nervous system but no eyes or identifiable light sensing structures. Here, we describe the planula of a box jellyfish, Tripedalia cystophora, and report that these larvae have an extremely simple organization with no nervous system at all. Their only advanced feature is the presence of 10-15 pigment-cup ocelli, evenly spaced across the posterior half of the larval ectoderm. The ocelli are single cell structures containing a cup of screening pigment filled with presumably photosensory microvilli. These rhabdomeric photoreceptors have no neural connections to any other cells, but each has a well-developed motor-cilium, appearing to be the only means by which light can control the behaviour of the larva. The ocelli are thus self-contained sensory-motor entities, making a nervous system superfluous. (Less)
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Contribution to journal
publication status
published
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in
Royal Society of London. Proceedings B. Biological Sciences
volume
270
issue
1531
pages
2349 - 2354
publisher
Royal Society
external identifiers
  • pmid:14667350
  • wos:000186705200005
  • scopus:0345304378
ISSN
1471-2954
DOI
language
English
LU publication?
yes
id
09089878-c04d-4f6a-bd09-a56049264b43 (old id 131481)
date added to LUP
2007-07-23 12:47:08
date last changed
2018-05-29 12:11:54
@article{09089878-c04d-4f6a-bd09-a56049264b43,
  abstract     = {Earlier detailed studies of cnidarian planula larvae have revealed a simple nervous system but no eyes or identifiable light sensing structures. Here, we describe the planula of a box jellyfish, Tripedalia cystophora, and report that these larvae have an extremely simple organization with no nervous system at all. Their only advanced feature is the presence of 10-15 pigment-cup ocelli, evenly spaced across the posterior half of the larval ectoderm. The ocelli are single cell structures containing a cup of screening pigment filled with presumably photosensory microvilli. These rhabdomeric photoreceptors have no neural connections to any other cells, but each has a well-developed motor-cilium, appearing to be the only means by which light can control the behaviour of the larva. The ocelli are thus self-contained sensory-motor entities, making a nervous system superfluous.},
  author       = {Nordström, Karin and Wallén, Rita and Seymour, Jamie and Nilsson, Dan-E},
  issn         = {1471-2954},
  language     = {eng},
  number       = {1531},
  pages        = {2349--2354},
  publisher    = {Royal Society},
  series       = {Royal Society of London. Proceedings B. Biological Sciences},
  title        = {A simple visual system without neurons in jellyfish larvae},
  url          = {http://dx.doi.org/},
  volume       = {270},
  year         = {2003},
}