05 Mar '12, 12am

Stinging Cells in Eyeless Hydra React to Light: Despite their lack of eyes, the stinging cells of Hydra magnipap...

Stinging Cells in Eyeless Hydra React to Light: Despite their lack of eyes, the stinging cells of Hydra magnipap...

Beautiful photomicrography, illustrating Hydra magnipapillata's tentacle bulbs. Neurons, including cnidocytes, are stained red and nuclei are stained blue. Musculature is shown in green; Credit: BMC Biology The Cnidarian, Hydra is familiar to us from Greek myths and as a tiny, freshwater inhabitant. Despite their lack of eyes Hydra magnipapillata have been known to respond to light and now research has found out how. Work such as this is not distinct from work on humans or other seeing organisms. We apparently have the same opsin light-reacting chemical and most likely have the Hydra as a distant ancestor! The research on such simple creatures might be thought to have found all there is to know, but David C Plachetzki and the other authors at the University of California (both Davis and Santa Barbara) express concern that more is yet to be learnt on the sensory reception o...

Full article: http://www.earthtimes.org/nature/eyeless-hydra-stinging-c...

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