What are Crustaceans?

A crustacean is a subphylum of the arthropoda. It has a layer of chitin on its surface, called a crustacean. Crustaceans mostly live in the ocean, and a few inhabit freshwater and land. Crustaceans such as shrimps and crabs have 5 pairs of feet, 4 of which are used for crawling and swimming, and a pair of cheeked feet are used for defense and predation.

Because of the animals of Crustacea

There are many different breeding methods of Crustacea, the simplest of which is

With few exceptions

Like other arthropods, the evolution of the crustaceans is not well understood. The main reason for this is that their crusts are more difficult to preserve as fossils. The earliest

General crustaceans and trachea (insects and

Crustaceans (more than 30,000 in the world) are distributed all over the world.

Different animals have different habits

Crustaceans in marine and freshwater ecosystems, especially small crustaceans that are zooplankton, play a very important role. They eat phytoplankton in the water, thereby controlling their growth. They account for the largest proportion of zooplankton. They are also direct or indirect food for other large aquatic animals.

People also eat some crustaceans directly (such as shrimp, crabs, and lobsters). Crustaceans are also used to purify water. They have the function of filtering dust, bacteria, and single-cell organisms, and combining poisons. Barnacles adsorbed on the hull can increase the resistance of the boat in the water and bring economic losses.

Crustaceans are arthropods with a hard shell that surrounds the body. Crustaceans include marine life, such as crabs, lobsters, small shrimps, and prawns.