: Sessile (fixed-in-place) sea creatures that attach to rocks, boats, or even whales . Scientific & Human Importance
: Because their shells are rigid, crustaceans must periodically shed and regrow them to accommodate growth.
The most well-known crustaceans belong to the order , characterized by five pairs of legs: crustacean
: They typically possess two pairs of antennae (antennules and antennae) and specialized mouthparts that function as jaws.
: Species like crayfish are common in rivers and lakes. : Sessile (fixed-in-place) sea creatures that attach to
: A few groups have adapted to life on land, including woodlice (sowbugs/pillbugs) and certain land crabs, though they still require damp environments to breathe through their gills. Common Examples
: A hard, chitinous outer shell that provides protection and structural support. Many species further harden this shell through calcification . : Species like crayfish are common in rivers and lakes
While they vary immensely in shape and behavior, most crustaceans share several defining biological traits: