GENERAL HISTOLOGY

Detailed explanation-1: -Sometimes called starfish, sea stars are the most well-known group of echinoderms. There are close to 2, 000 species of sea stars.

Detailed explanation-2: -Answer and Explanation: The largest class in phylum Echinodermata with the most number of species is Ophiuroidea with the more popular class Asteroida a near second.

Detailed explanation-3: -Overview. Sea stars are invertebrates related to sea urchins, sea cucumbers and sand dollars, which are all echinoderms. Echinoderm means spiny skin-a reference to their hard, calcified skin, which helps to protect them from predators.

Detailed explanation-4: -A group of sea stars or starfish are called a ‘galaxy. ‘ Sea stars can be found living at the bottom of marine environments throughout the world’s oceans.

Detailed explanation-5: -Sea stars are actually part of the phylum Echinoderm and are related to sea urchins, brittle stars and sea cucumbers – they are not fish at all!