Have a dermal skeleton with spines and plates only found in marine environments?

A dermal skeleton with spines and plates is characteristic of certain marine organisms, particularly echinoderms like sea urchins and some species of fish. These structures provide protection and support, helping these animals thrive in their aquatic habitats. While dermal features are present in some terrestrial species, the specific combination of spines and plates is primarily found in marine environments. This adaptation allows them to cope with the unique challenges of ocean life, such as predation and buoyancy.