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A simple visual system without neurons in jellyfish larvae

In English

Författare

Summary, in English

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.

Publiceringsår

2003

Språk

Engelska

Sidor

2349-2354

Publikation/Tidskrift/Serie

Royal Society of London. Proceedings B. Biological Sciences

Volym

270

Issue

1531

Dokumenttyp

Artikel i tidskrift

Förlag

Royal Society Publishing

Ämne

  • Zoology

Status

Published

Forskningsgrupp

  • Lund Vision Group

ISBN/ISSN/Övrigt

  • ISSN: 1471-2954