GENERAL HISTOLOGY

Detailed explanation-1: -Ophiuroids are a large group (over 1600 species) of echinoderms that includes the brittle stars (Ophiurida) and basket stars (Euryalida). The more familiar Ophiurida, or brittle stars, usually have five arms and superficially resemble true starfish (Asteroidea).

Detailed explanation-2: -Overview. Ophiuroidea are commonly known as brittle stars based on the fragile nature of their snake-like arms.

Detailed explanation-3: -Pedicellariae, also found in the asteroids, are absent from crinoids, ophiuroids, and holothurians.

Detailed explanation-4: -3.83). Sea stars (class Asteroidea) and brittle stars (class Ophiuroidea) have flat bodies with a broad aboral surface facing up and an oral surface facing down. Both groups have arms projecting from a central body disc and the ambulacral regions with the projecting tube feet extending along each of the arms (Fig.