GENERAL HISTOLOGY

Detailed explanation-1: -The name ‘Echinodermata’ originated from the terms ‘echinos’ meaning spines and ‘derma’ meaning skin. Hence, this name denotes spiny-skinned organisms.

Detailed explanation-2: -Echinoderm means spiny skin. If we break the word down echino = spiny and derm= skin, so these animals are spiny-skinned. Sea stars and their cousins are part of a group of spiny-skinned animals. Sea Stars: Most sea stars have five arms.

Detailed explanation-3: -Who are these “spiny skinned animals”? They are the sea stars (starfish), sea urchins, sand dollars, sea cucumbers, and sea lilies. They all live in marine waters. And scientists have classified them all in the phylum Echinodermata.

Detailed explanation-4: -Spiny skinned animals are placed in Echinodermata. The spines on the skin in echinoderms are part of the endoskeleton. The endoskeleton is made up of calcium carbonate plates called ossicles that bear spines which project outside.

Detailed explanation-5: -: having a skin covered with knobs, tubercles, or spines.