There are many varieties of sea urchins, and there are more than 900 existing varieties. They can be divided into regular sea urchin subclass and irregular sea urchin subclass of these two kinds of subclasses, these two kinds of subclasses in a **** have 22 orders, there are more than 900 kinds of species, belonging to 224 genera. China has found more than 100 kinds of sea urchin species, in addition, the sea urchin has more than 7000 kinds of fossil species.
Common sea urchin varieties are horse manure sea urchin, purple sea urchin, the North Sea purple sea urchin, red sea urchin, long spiny sea urchin and so on. Horse dung sea urchins are mainly from the area south of Hokkaido, Japan, and are generally about 4 centimeters in diameter. Their shell spines are shorter but denser and mostly yellow-green in color. Purple sea urchins are a common sea urchin species in Japan, they are on the large side, with an adult diameter of between 5-7 cm and a lavender color. Red sea urchins are reddish brown in color, but their production is relatively rare, and they are less common on the market.
Second, how to pick sea urchinsTo pick a good sea urchin, first of all, you need to choose some sea urchins with plump mouths and slightly protruding, because this kind of sea urchin is very fresh. If the mouth is sunken and dark in color, it is not fresh. The second thing is to choose the fattest sea urchin, usually the sea urchin with short and thick thorns on the outside is fattier, while the thin and long thorns are leaner. The last is to look at the color, there are many types of sea urchins, colorful sea urchins are generally inedible, only the common black or brown sea urchins are edible.