serpent-like arms of the brittle star) are echinoderms in the class Ophiuroidea, closely related to starfish. They crawl across the sea floor using their...

The subphylum includes the class Asteroidea (the starfish), the class Ophiuroidea (the brittle stars and basket stars), and the extinct order Somasteroidea...

mesh of collagen fibres. Historically, taxonomists believed that the Ophiuroidea were sister to the Asteroidea, or that they were sister to the (Holothuroidea...

Dicyemida Crinoidea (sea lilies and feather stars) Asteroidea (star fish) Ophiuroidea (brittle stars) Echinoidea (sea urchins) Holothuroidea (sea cucumbers)...

The Melbourne Formation is a geologic formation in Victoria, Australia. It preserves fossils dating back to the Ludlow epoch of the Silurian period. The...

the central disk of a sea star or sea urchin or the oral surface of Ophiuroidea. Close up, it is visibly structured, resembling a "madrepore" (stone...

plankton. They are part of the class Ophiuroidea, which is the largest class of echinoderms. The name Ophiuroidea comes from the roots, ophis, meaning snake...

Ophiuroidea Brittle stars Asteroidea Starfish...

marine echinoderms including three classes: Asteroidea: true sea stars Ophiuroidea: brittle stars and basket stars Somasteroidea (sometimes also Stomasteroidea):...

including starfish (Asteroidea), sea urchins, (Echinoidea), brittle stars (Ophiuroidea), sea cucumbers (Holothuroidea) and feather stars (Crinoidea). The largest...