Crustaceans

What are Crustaceans?

Crustaceans are a class of aquatic invertebrates with a hard exoskeleton, jointed limbs, and segmented bodies. Examples include crabs, lobsters, shrimp, and copepods, which are important for food chains in aquatic ecosystems.

Animals with Hard Shells

Crustaceans are animals that live in water and have a hard shell on the outside of their bodies, called an exoskeleton. They include crabs, lobsters, shrimp, and barnacles. Crustaceans can live in oceans, rivers, and even on land in damp areas.

What Makes Them Special?

Crustaceans have unique features:

• Exoskeleton: A hard outer shell that protects their body.
• Jointed Legs: They have legs with joints, which help them crawl, swim, or grab food.
• Antennae: Long feelers they use to sense their surroundings.

Examples of Crustaceans

• Crabs: Walk sideways and use claws to grab food.
• Lobsters: Live on the ocean floor and are often caught for food.
• Shrimp: Swim in groups and are a key part of the food chain.
• Barnacles: Stick to rocks, boats, or whales and filter food from the water.

Why Crustaceans Are Important

Crustaceans play a big role in aquatic ecosystems:

• Food Source: Many animals, like fish and birds, eat crustaceans. Humans also rely on them for seafood.
• Cleaners: Some, like shrimp, eat dead plants and animals, helping keep the water clean.
• Ecosystem Builders: Crustaceans like crabs dig and burrow, which helps oxygen reach the ocean floor.

Where Crustaceans Live

Crustaceans can be found in many places:

• Oceans: Coral reefs, sandy beaches, and deep-sea floors.
• Freshwater: Rivers, lakes, and streams.
• Land: Some, like woodlice, live in damp soil or under rocks.

Amazing Facts About Crustaceans

• Crabs can regenerate a lost claw or leg.
• Some shrimp can glow in the dark (bioluminescence).
• Lobsters use their strong claws to crush shells or catch prey.

Why Crustaceans Matter

Crustaceans are fascinating and vital creatures that keep aquatic ecosystems healthy. By learning about and protecting them, we ensure they can thrive for future generations!