Directly Related:
* Crustacean: Any of a large class of mainly aquatic arthropods, typically having a chitinous exoskeleton, a segmented body, and jointed limbs, including crabs, lobsters, shrimps, and barnacles.
* Crustaceology: The branch of zoology that deals with crustaceans.
* Crust: The hard outer layer of bread, pastry, or other baked goods.
* Crustaceous: Of or relating to crustaceans.
Less Directly Related:
* Excrustate: To remove the crust from something.
* Encrustic: Covered with a crust or coating.
* Incustation: The act of forming a crust or coating.
Note: While "crusta" is a root, it's not often used directly to form English words. You'll usually see it as part of a larger word or used in scientific contexts.