aquatic invertebrate的意思|示意

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Aquatic invertebrates are organisms that do not have an internal skeletal structure and live in a watery environment. They include mollusks, worms, crustaceans, jellyfish, echinoderms, and sponges. While they may differ in size and shape, they all play important roles in the aquatic ecosystem.

Mollusks are the second largest class of aquatic invertebrates after arthropods. They have soft bodies and range from tiny snails to giant squid. Mollusks use a muscular foot to move along or anchor themselves to the substrate and feed on algae and other small organisms.

Worms are segmented invertebrates that live in a variety of aquatic habitats. They can range from a few millimeters to several meters in length. Worms feed on sediment, decaying organic matter, and small organisms.

Crustaceans are a group of aquatic invertebrates that have a two-part body and jointed legs. They include shrimp, crabs, lobsters, barnacles, and copepods. Crustaceans feed on plankton, other small organisms, and organic matter.

Jellyfish are gelatinous animals that live in oceans and seas. They have stinging cells that are used to capture prey and can travel long distances using the ocean’s currents. Jellyfish feed on small fish and plankton.

Echinoderms are soft-bodied invertebrates that have radial symmetry, spiny skin, and a unique water-vascular system. They include starfish, sea urchins, and sea cucumbers. Echinoderms feed on algae, detritus, and small invertebrates.

Sponges are a group of animals that lack a true body cavity and are covered in tiny pores. Sponges are filter feeders and feed on small particles of food suspended in the water.

Aquatic invertebrates play an essential role in the aquatic ecosystem. They are important sources of food for other animals and help recycle nutrients, such as nitrogen, phosphorus, and carbon, in the environment. Furthermore, they are essential to maintaining a balanced aquatic environment.