Scallop

Scallops live in all the world's oceans.

They do not live in fresh water. Most scallops stay on the sandy ocean floor.

Some scallops use a tiny string to hold on. They can also swim to escape danger. To swim, they clap their shells together fast. This pushes water out to move them.

Scallops have many tiny eyes around their edges. These eyes help them see moving shadows. They are very pretty to collect on beaches.

Scallops are sea animals with two shells.

They live in every ocean in the world. Most scallops stay on the sandy ocean floor.

Some use a tiny string to hold on. This string is called a byssal thread.

Many scallops can swim to escape danger. They use a way called jet propulsion. To do this, they clap their shells together fast. This pushes water out to move them. They have a big muscle to help. This is the adductor muscle. It helps them snap their shells shut.

Scallops have a very cool way of seeing. They have many small eyes around their edges.

These eyes can find up to 200 spots. They use tiny mirrors to see light. This helps them spot moving shadows. These shadows might be a predator like a starfish.

Scallops eat tiny bits of food in the water. They are filter feeders. They trap food in mucus. Then, they move the food to their mouth. People also enjoy eating the scallop meat.

Scallops are amazing sea animals known as bivalve molluscs.

They belong to a family called Pectinidae. Most scallops live in all the world's oceans. However, you will never find them in fresh water. They are often free-living, which means they can move around. Many species can swim short distances very quickly. Some even move across the ocean floor to find new spots.

To move, scallops use a way called jet propulsion. They do this by clapping their two shells together.

This action pushes water out to move them through the sea. They have two different types of adductor muscles to help. One muscle is striated, which helps them swim very fast. The other is a smooth muscle for staying closed. This allows them to keep their shells shut for a long time. They do this without using much energy at all.

Scientists have studied these creatures for a very long time. The family name Pectinidae comes from the Latin word pecten. This word means a comb. It refers to a comb-like structure on the shell called a ctenolium. This special feature is found in modern scallops. Even though it is important for naming them, some adult scallops lose it. No other bivalve has a shell feature like this one.

Scallops have many interesting body parts and numbers. They can have up to 200 small eyes around their mantle.

These eyes are only about 1 millimeter wide. They use tiny mirrors made of guanine crystals to see. This helps them spot shadows from predators like starfish. Most scallops live in shallow water up to 100 meters deep. They can be found on rocks, coral, or even seagrass.

People have interacted with scallops for many centuries. Many species are highly prized as a food source. The meat people eat is actually the large adductor muscle.

Collectors also love their beautiful, fan-shaped shells. These shells often have bright colors and pretty ridges. Because of this, people have used scallop shapes in art and buildings since ancient times. You might even find beautiful shells while walking on a beach.

{ "text": "Scallops are marine animals belonging to the family Pectinidae. They are a type of bivalve mollusc, which means they have a shell with two sides, or valves. While many bivalves stay in one place, scallops are mostly \"free-living.\" This means they can move around the ocean floor. Some species can even swim through the water to escape danger.

\n\nThe shell of a scallop is a very organized structure. It consists of a left valve and a right valve. Most scallops rest on their right valve. Because of this, the right valve is often deeper and more rounded. The left valve is usually flatter or even concave. Both valves meet at a straight hinge line at the top. On either side of this hinge, the shell forms two flat wings called auricles or ears.

\n\nScallops move using a method called jet propulsion. To do this, they use a large central adductor muscle. This muscle is actually made of two different types of tissue. The first is the striated adductor muscle, which contracts very quickly for swimming. The second is the smooth catch adductor muscle. This muscle allows the scallop to keep its shell closed for long periods without using much energy.

\n\nWhen a scallop senses a predator, such as a starfish, it reacts quickly. It can move in two different ways. First, it can swim forward through the water. It does this by sucking water into the gape, the space between the valves. It then ejects the water through small holes called exhalant apertures. Second, it can \"jump\" backward. In this movement, the scallop ejects the water out of the same side it entered.

\n\nScallops have a very advanced sensory system for such small creatures. They have up to 200 tiny eyes arranged around the edge of their mantle. Each eye is only about 1 millimeter wide. Instead of using a lens like humans do, these eyes use a mirror made of guanine crystals. This mirror helps them detect light and motion. This acts as an early-warning system to spot shadows from approaching predators.

\n\nThe nervous system of a scallop is also quite complex. They do not have a single brain. Instead, they use three pairs of ganglia, which are clusters of nerve cells. The largest is the visceral ganglia, located near the center of the body. These connect to a circumpallial nerve ring that loops around the mantle. This ring connects to the scallop's many eyes and tentacles.

\n\nScientists use specific features to identify different species. One important feature is the ctenolium. This is a comb-like structure located on the edge of the right valve. The family name Pectinidae actually comes from the Latin word \"pecten,\" which means comb. While many adult scallops lose this feature, all scallops possess a ctenolium at some point in their lives. This is a unique trait that no other bivalve possesses. [IMAGE:File:Naturalis Biodiversity Center - RMNH.MOL.321025 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris Lamarck, 1819 - Pectinidae - Pecten tigris