Question

The calcareous plates found underneath the epidermis are called the:

a. Dermal spines
b. Test
c. Pedicellariae
d. Ampullae

Answer 1

The calcareous plates found underneath the epidermis of echinoderms are called the test.

Step-by-step explanation:

The calcareous plates found underneath the epidermis of echinoderms are called the test. The test is a hard, internal endoskeleton made up of multiple calcium carbonate plates that provide support and protection to the animal. These plates are covered by a thin layer of skin called the epidermis.