GENERAL HISTOLOGY

Detailed explanation-1: -Brittle stars belong to the class Ophiuroidea. Unlike sea stars, which have plump arms, brittle stars have long, thin arms that are sharply demarcated from the central disk. Brittle stars move by lashing out their arms or wrapping them around objects and pulling themselves forward.

Detailed explanation-2: -Ophiuroids exhibit the three distinctive characteristics of the phylum Echinodermata: a body plan with five part symmetry (pentaradial), an internal calcium carbonate skeleton in the mineral form of calcite, and a water vascular system of fluid-filled vessels that end in tube feet.

Detailed explanation-3: -Overview. Ophiuroidea are commonly known as brittle stars based on the fragile nature of their snake-like arms.

Detailed explanation-4: -Sea stars are in the class Asteroidea, where brittle stars are in Ophiuroidea, which also includes basket stars. To tell the two apart, first look at their bodies. Their fundamental structure is different, especially when you look at where the arms connect to the center of the body.