Ophiurioidea
Ophiurioidea , noun, plural
[New Latin, from Greek 'o`fis serpent + 'oyra` tail + e'i^dos form.]
(Zoology) A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star.
Also: Ophiuroidea