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I don't know what it is off the top of my head, but I'm pretty sure I read about it in the Fenner/Calfo book. Also if I can type this long enough the margins will be right again, LMAO.
ya I have one on a rock, my wife actually spotted it.I though it might have just been a chip of the rock coming off with some algae stuck to it.Mine is covered in coralline.Let me know if you find anything out man