Suddenly found that Shenzhen sea urchin is really many, in fact, some are also quite beautiful, as shown in this variety of sea urchin.

Photographed on June 29, 2018 in the waters of Dapeng Dashuik in Shenzhen
I always thought that this was a blue dress sea urchin, but I learned that it was not, although they can be called short-spined sea urchins, but they are still two different varieties, and it is better to distinguish them.
It can also be called horse dung sea urchin and short-spined sea urchin. It is characterized by short spines of white and red, and the three colors of white, red and purple are interspersed, and the colors are colorful.
This sea urchin is common in the waters of Guangdong, Hainan, Taiwan and the Paracels. Because it is a type of horse dung sea urchin, it is an edible sea urchin.
Uploaded sea urchins (click to view):
Devil's Sea Urchin
Ring thorn sea urchin
Horned sea urchin
Purple sea urchin
Sand gall
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