We have 4 of these urchins in our tank. Interestingly, there are some 750 species of sea urchins. However, all of our marine biology reference books only show Long-spined Urchins with all black spines and correspondingly dark mouth parts.
This is true on two of our four.
Their “eye” is weird-looking.
However, one of our urchins has about half its spines black and the other half white.
And white mouth parts
And another one has barber pole-like spines that alternate black and white on the same spine.
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