Ophiuroidea Ms Mariya Joy Department of Zoology Class ophiuroidea Popularly known as basket stars brittle starsor serpent stars Basket stars Branched arms Brittle stars Fragile and easily breakable arms ID: 1020415
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1. Phylum echinodermataClass OphiuroideaMs. Mariya Joy Department of Zoology
2. Class ophiuroideaPopularly known as basket stars, brittle stars,or serpent stars.Basket stars -Branched armsBrittle stars -Fragile and easily breakable armsSerpent stars – Serpentine movement of the arms.Ophiuroids resemble asteroids.BCZ it’s body consists of central disc and arms .Their arms are long, slender and more sharply set off from the disc
3. Brittle star
4. Basket star
5. Serpent star
6. Salient features* Flat body ,with a thin disc and five or more slender and flexible arms .*Arms are formed of a series of segment – like section or articles each article being formed of four shields.*Ambulacral grooves , pedicellariae and dermal branchiae are absent.*Tube feet are without ampullae and suckers.*Gut is blind sac without intestine and anus.*Madreporite is on the oral surface .*Sexes are seperate .*Development is indirect with a larva called ophiopluteus.