Most sea cucumbers have bone fragments, such as watches, buttons, rods, perforated plates, patterns, wheels, anchors, cages and so on. The number varies, an ugly sea cucumber has about 20 million bone pieces, while sweet potatoes sometimes have no bone pieces at all; Stichopus japonicus with more bone pieces feels rough, while those with less bone pieces are smooth; Bone fragment is a kind of single caries endoskeleton and a smaller bone plate.
The unique organ of sea cucumber is the lime ring, which plays the role of supporting the pharynx, nerve ring and circulating water pipe. Generally, it consists of 5 spokes and 5 middle spokes; The lime ring of some cladocera sea cucumbers is inlaid with many small pieces, and each spoke extends backwards into a fork. Generally, the lime circle with a ratio of 100 or more is not enough.
Sea cucumber has gonads, which are located on one side or both sides of the mesentery, and there is a main tube between the dorsal midline or the tentacles behind it. The "coral mussels" sold in the seafood market are actually the edible parts left after these intestines are cleaned, and they are one of the materials when eating hot pot.
Extended data:
1, lifestyle
When the water temperature reaches 20℃, Stichopus japonicus will move into the crevices of rocks in the deep sea or hide at the bottom of rocks. If you don't eat, your whole body will shrink and become as hard as a thorn ball. Ordinary animals don't eat. It sleeps in summer and wakes up after autumn to resume its activities.
2. Growth and reproduction
In order to ensure that the human race will not be extinct, sea cucumber has super reproductive ability in the long-term natural selection evolution process. An adult sea cucumber over 4 years old can ovulate about 5 million pieces at a time during the spring breeding period. In this way, even if there is a survival rate of one in ten thousand, the continuation of the race can be guaranteed.
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