A simple visual system without neurons in jellyfish larvae. Export

@article{citeulike:2972275, 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.}, address = {Department of Cell and Organism Biology, Zoology, Lund University, Helgonav. 3, 223 62 Lund, Sweden.}, author = {Nordstr\"{o}m, K. and Wall\'{e}n, R. and Seymour, J. and Nilsson, D.}, citeulike-article-id = {2972275}, citeulike-linkout-0 = {http://dx.doi.org/10.1098/rspb.2003.2504}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/14667350}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=14667350}, day = {22}, doi = {10.1098/rspb.2003.2504}, issn = {0962-8452}, journal = {Proceedings. Biological sciences / The Royal Society}, keywords = {affordance, ecologicalpsychology, embodiment, evolution, jellyfish}, month = {November}, number = {1531}, pages = {2349--2354}, posted-at = {2008-07-08 11:28:59}, priority = {2}, title = {A simple visual system without neurons in jellyfish larvae.}, url = {http://dx.doi.org/10.1098/rspb.2003.2504}, volume = {270}, year = {2003} }

TY - JOUR ID - citeulike:2972275 L3 - citeulike-article-id:2972275 N2 - 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. IS - 1531 JF - Proceedings. Biological sciences / The Royal Society SN - 0962-8452 AD - Department of Cell and Organism Biology, Zoology, Lund University, Helgonav. 3, 223 62 Lund, Sweden. EP - 2354 TI - A simple visual system without neurons in jellyfish larvae. VL - 270 SP - 2349 KW - affordance KW - ecologicalpsychology KW - embodiment KW - evolution KW - jellyfish AU - Nordström, K AU - Wallén, R AU - Seymour, J AU - Nilsson, D PY - 2003/11/22/ UR - http://dx.doi.org/10.1098/rspb.2003.2504 ER -