Crustaceans are creatures that have many characteristics but there main one is that they have several plates made of calcium to protect its body.
some other characteristics include
See creatures usually evolve into crustaceans so that they can withstand large amounts of pressure when in deep waters.
Crustacens are loster,srimp,and crab. Also krill crayfish barnacles.
Crustatian means a animal with a shell for example : a crab has a shell!
Anthropods, sub-group crustatians
all sea creatureswith a hard shell are called crustatians, so yes a shrimp is also a crustatian.
Crayfish and Lobsters belong to Class Malacostraca.
An arthropod is an animal that has an exoskeleton.Specifically, an arthropod is recognizable by its external skeleton, jointed legs and segmented body. Examples include crustaceans and insects. The larger-sized external skeleton of mollusks tends to be called a shell.