Crabs, about 4700 species worldwide, about 800 species in China, the common ones are the genera of Guan Gong crab, pike crab, brook crab, beckoning tide crab, mitten crab and so on. Crooked tail suborder in the porcelain crab, cicada crab, anthropomorphic stone crab, hermit crabs, coconut crabs and other genera are also known as crabs.

1, hermit crabs

Hermit crabs have two kinds, one is called the long-fingered fine cheliped hermit crabs, this crab is distributed in China's Taipei County, Yilan County, Penghu and the east coast of Africa from the east through the Indo-Pacific Ocean - Pacific Ocean to the Malay Peninsula, the Philippines, and north to Taiwan, Japan.

2, thick striped crab

often live in the low tide line on the rocky beach, crawling quickly. Gill cavity is often parasitic isopods. Prey on small intertidal invertebrates such as cap shells, but also eat dead animals and algae. Distributed in North Korea, Japan, the United States Pacific coast and mainland China in Guangdong, Fujian, Zhejiang and other places.

3, Zodiac crab

Subordinate eight kinds of crab, mainly including the head Zodiac crab, common Zodiac crab (bread crab), North Zodiac crab (Jonah crab), mottled Zodiac crab (dew-toe crab), Chilean stone crab (Chilean bread crab), as well as North America's three kinds of rock crabs, which the Jumbo Crab, Bread Crab, Jonah crab can be described as a trio in the Zodiac crab.

4, dawn crab

Dawn crab, also known as diving sand crab, sand with life in fine, medium sand or broken 売泥质沙底, water depth 16-40 meters, low tide can also be picked up; flat feet not only to help swim, when frightened, can be used to the end of the feet in the sand digging sand, by the back of the body to dive into the sand quickly. Distributed in Korea, Japan, China, Australia, Indonesia, Singapore, Vietnam, Thailand, India, Iranian Gulf, South Africa and other Indian to Pacific Ocean waters.

5, the tide crab

Its biggest feature is the size of a pair of chelae, only the male crab has a large chelae, the female crab's two chelae are very small. In addition, the crab also has a pair of matchstick-like protruding eyes, very special.