Here are some examples of crustaceans:
* Crabs: They have a hard exoskeleton (shell) and two pairs of antennae.
* Lobsters: Similar to crabs, they also have a hard exoskeleton and two pairs of antennae.
* Shrimp: Their shells are softer than crabs and lobsters, but they still have two pairs of antennae.
* Barnacles: These are sessile crustaceans, meaning they attach to surfaces. They have a hard shell and two pairs of antennae.
* Crayfish: They resemble lobsters, but are smaller and freshwater dwelling. They also have a hard shell and two pairs of antennae.
There are many other types of crustaceans, all with shells and antennae.