Don't we have single celled organisms with more than one 'eye' now?

We've been able to sense light and shadow even before we became multicellular, didn't we? And this article seems to be implying rather otherwise.

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ckemere 4 hours ago | parent | next [-]

Jellyfish (cnidarians) do phototaxis - https://journals.biologists.com/jeb/article/227/18/jeb247503...

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emmelaich 6 hours ago | parent | prev [-]

I was looking for that too. I'm sure I've read that single cell animals were sensitive to light (and/or heat). I guess it's a speculation though, because we'd have no physical evidence.

	▲	hinkley 6 hours ago \| parent [-]
		We know that modern flagellates can steer to or away from light. When they started doing that is, as you say, pretty difficult to establish since they haven't left archaeological evidence. Unlike shellfish.