GENERAL HISTOLOGY

Detailed explanation-1: -Note: The echinoderms or the phylum Echinodermata have the presence of spiny skinned animals. They usually have bilateral symmetry and also have the presence of a triploblastic layer. They are mostly marine. Starfish is an example of echinoderm.

Detailed explanation-2: -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-3: -: any of a phylum (Echinodermata) of radially symmetrical coelomate marine animals including the starfishes, sea urchins, and related forms.

Detailed explanation-4: -Echinoderms are named for the spines or bumps covering the outer surface of the bodies of many of them (Greek root word echino-meaning spiny; Latin root word-derm meaning skin). Examples of echinoderms include sea stars, sea urchins, sea cucumbers, brittle stars, and feather stars (Fig.