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A simple visual system without neurons in jellyfish larvae

Författare:
Publiceringsår: 2003
Språk: Engelska
Sidor: 2349-2354
Publikation/Tidskrift/Serie: Proceedings of the Royal Society of London Series B - Biological Sciences
Volym: 270
Nummer: 1531
Dokumenttyp: Artikel
Förlag: Royal Society

Sammanfattning

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.

Disputation

Nyckelord

  • Biology and Life Sciences

Övriga

Published
Yes
  • Lund Vision Group
  • ISSN: 0962-8452

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