GENERAL HISTOLOGY

Detailed explanation-1: -Echinoderms have a spiny endoskeleton. They have radial symmetry as adults but bilateral symmetry as larvae. Echinoderms have a unique water vascular system with tube feet.

Detailed explanation-2: -Examples of echinoderms include sea stars, sea urchins, sea cucumbers, brittle stars, and feather stars (Fig. 3.83). Although they may appear very different, echinoderms all have two major defining characteristics that set them apart from all other animals: a water vascular system and five-sided radial symmetry.

Detailed explanation-3: -Echinoderm Features: Internal skeleton made of little calcium plates. Five-part symmetry. Special fluid-filled water vascular system that operates the tube feet.

Detailed explanation-4: -Phylum Echinodermata belongs to kingdom Animalia, they are triploblastic animals. Examples of echinoderms include sea star, sea urchins etc. Echinoderms are marine animals, they are unisexual and their body have a tough spiny exoskeleton.

Detailed explanation-5: -Echinodermata means “spiny-skinned, ” and this phylum includes such spiny animals as sea stars and sea urchins. The skin covers an internal skeleton. Like cnidarians (e.g., jellyfish and corals), the bodies of echinoderms are organized around a central point; they exhibit radial symmetry.