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Posts Tagged "cnidaria"

The Artful Amoeba

The Jellyfish that Conquered Land — and Australia


Most people know jellyfish and their ilk — the cnidarians, of sea pen, anemone, coral, and man’o’war fame — live in water and (happily for us) stay pretty well confined to it. But as it turns out, that’s not entirely the case. In 1935, in a fit of profound naïveté, the government of Queensland introduced [...]

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Animal vision evolved 700 million years ago

All animal eyes and eye-spots contain opsin, a protein that captures light. This is the compound eye of the Antarctic krill. Photo by Gerd Alberti and Uwe Kills

Gaze deep into any animal eye and you will find opsin, the protein through which we see the world. Every ray of light that you perceive was caught by an opsin first. Without opsin there would be no blue, no red, no green. The entire visible spectrum would be.. just another spectrum. But opsins haven’t [...]

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