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 taxa Somasteroidea...

generally recognized: the Asteroidea (starfish, with some 1,745 species), Ophiuroidea (brittle stars, with around 2,300 species), Echinoidea (sea urchins and...

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

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...

The Nusplingen Limestone (German: Nusplingen Plattenkalk) is a geological formation in Baden-Württemberg, Germany. It preserves fossils dating to the Kimmeridgian...

in F. A. Bather's echinoderm taxonomy, which grouped Asteroidea and Ophiuroidea within it as subclasses due to their Paleozoic history. In 1966, the...

Echinodermata Subphylum Asterozoa Class Asteroidea (starfish) Class Ophiuroidea (brittle stars) Subphylum Blastozoa † Subphylum Crinozoa (sea lillies...

The taxonomy and phylogeny of species in the order Euryalida and class Ophiuroidea has been ambiguous and continues to be investigated. Euryalid fossils...

The marine waters of the Houtman Abrolhos, an island chain off the coast of Western Australia, has been recorded as containing 172 species of echinoderm...