Crustacean

A crustacean is a primarily aquatic arthropod characterized by a hard, protective exoskeleton, a segmented body, and typically two pairs of antennae. This diverse group encompasses a wide variety of species, from small, microscopic creatures like copepods to large animals such as crabs and lobsters. Most crustaceans are found in marine environments, but some have adapted to freshwater and even terrestrial habitats. They play crucial roles in aquatic ecosystems, serving as both prey and predators. Their bodies, including their hard shells or carapace, often exhibit a complex arrangement of appendages used for walking, swimming, feeding, and sensing their environment. The exoskeleton requires molting for growth.

Crustacean meaning with examples

• The coastal tide pools teemed with life, including numerous small crustaceans scuttling across the rocks. The child, fascinated, gently prodded a small crab, noticing its protective carapace and grasping claws. She collected a few hermit crabs to put in a bucket to explore with later.
• Lobsters, a popular seafood, are a type of crustacean known for their large claws and tough shells. The chef carefully selected the freshest lobsters from the tank for the evening's specials. The customers raved over their meal after the crustacean was perfectly prepared.
• Planktonic crustaceans, like copepods, are the foundation of many marine food webs. These tiny organisms feed on phytoplankton and are in turn consumed by larger animals like fish. Researchers are analyzing the copepod population to measure the health of the ocean.
• During the summer months, the beaches experienced a massive influx of tiny crustaceans, leaving an orange line. These small sand crabs were actively digging into the wet sand, burrowing to stay safe. The waves crashed onto the shore, burying the crustacean.
• The scientist spent years studying the exoskeleton of crustaceans to understand its composition and its role in protection and locomotion. He discovered that the structure was the reason behind why some arthropods do not sink.