sea urchin violet things

  1. itelshot

    What are those violet things on my new sea urchin (mespilia globulus) and question about behavior?

    Today i bought my first sea urchin. It was on it's way about 6 hours in a bus. Firstly, i was surprised that it hadn't got purple-blue lines like it was on the internet, now i can see that it starts to release that short purple-blue "hair" in places where lines should be. I'm just curious: 1...
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