But maybe this will help. Does your urchin seem to get angry for no reason whatsoever? Does it say one thing and mean another? Does it like to watch "What Not to Wear" on TV? These things could be a hint that yours if a female.
honestly idk why you want/need to know the sex of your specimen.
heres a qoute from this article: "It is impossible to tell what sex sea urchins are until they shed gametes from the five pores on the top center of the animal" Salmon Lab Protocols: Sea Urchin Axonemes
If the ocean's floor is any indication it seems like it shouldn't be too difficult
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