Tones are: ch, q; The vowels are e and u.

Manjianghong is a bivalve marine animal among mollusks. * * * There are 9 species in 2 genera of 1 family, which is the largest bivalve in the ocean. Known as the "king of shellfish", it has a maximum length of over 1 m and a weight of over 300 kg. The shell is thick, the edge of the shell is like teeth, the two shells are the same size, and the inner shell is white and smooth, as white as jade. External ligament, usually with a large foot wire hole. The hinge has a main tooth and 1 ~ 2 rear teeth. Coat marks are intact, the former obturator internus disappears, and the latter obturator internus is near the center.

They are all tropical species and usually live on coral reefs with plenty of silk. It is the largest individual shellfish in bivalves, and the length of the big shell can reach 1 meter. There are a large number of zooxanthellae in the mantle. With the help of the vitreous body in the membrane, zooxanthellae can multiply as its own nutrients, forming a special and mutually beneficial relationship.

Extended data

Often born with a large number of zooxanthellae. This unicellular algae can circulate in water chestnut and carry out photosynthesis, which provides abundant nutrition for water chestnut. There is a structure called vitreous at the edge of the mantle of cockroaches, which can gather light and make zooxanthellae multiply in large numbers. This special relationship between clams and algae is called reciprocal growth. In addition, they eat plankton.

Meat is edible, and big shells can be used as water containers or raw materials for shell carving. Some dragonflies can produce pearls. Small shells can be fired with lime and can also be used for viewing. In some countries, pangolins and pangolins have been successfully farmed.

When the sea water flooded the sea, it opened its shell and stretched out the thick mantle edge for activities. Like other bivalves, dragonflies carry food through the sea water flowing through their bodies. But they not only eat in this way, but also have the ability to grow food in their own tissues.

Insect yellow algae can make full use of the convenient conditions provided by the mantle to reproduce, such as space, light and phosphorus, nitrogen and carbon dioxide in metabolites; You can use zooxanthellae as food. The reason why it grows so huge is that it can get food from two aspects.