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Plate of brittle stars from the Kunstformen der Natur from Ernst Haeckel (1904) Second plate of brittle stars from Haeckel. Between 2,064 [11] and 2,122 species of brittle stars are currently known, but the total number of modern species may be over 3,000. [12] This makes brittle stars the most abundant group of current echinoderms (before sea ...
Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (/ ˌ æ s t ə ˈ r ɔɪ d i ə /). Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as asteroids due to being in the class
Amphiuridae (commonly called long-armed burrowing brittle stars [2] or burrowing brittle stars) are a large family of brittle stars of the suborder Gnathophiurina.Some species are used to study echinoderm development (e.g. Amphipholis kochii [3] and Amphioplus abditus [4]) and bioluminescence (the dwarf brittle star, Amphipholis squamata [5] [6]).
This brittle star has a circum-boreal distribution. In the northern Atlantic Ocean it is common around Iceland, Spitzbergen and Norway southwards to the North Sea.On the eastern coast of North America its range extends from Greenland southwards to Long Island, and in the Pacific Ocean, its range stretches from Japan and the Bering Sea southwards to California. [3]
Amphiodia occidentalis, the long-armed brittle star, is a species of brittle star belonging to the family Amphiuridae. It is found in the Eastern Pacific coast from Alaska to USA, [2] often on the seafloor within intertidal and subtidal zones. Within these areas, it is often found buried a few centimeters under the sand with 2 or 3 arms ...
Amphiura is a large genus that is currently divided into the following six subgenera: Amphioplus, Amphiura, Fellaria, Ophionema, Ophiopelte and Ophiopeltis.The once used subgenus Acrocnida has been elevated to a genus rank.
Ophiothrix is a large genus of brittle stars (Ophiuroidea) found in oceans worldwide from tropics to Arctic and Antarctic regions. At present a total of 93 Ophiothrix species have been recognized. It is considered as one of the most interesting genera because of the presence of its brilliant colors and associations with coral and sponges as well.
The Asterozoa are a subphylum in the phylum Echinodermata, within the Eleutherozoa.Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the classes Asteroidea (the starfish or sea stars), Ophiuroidea (the brittle stars and basket stars), Somasteroidea (early asterozoans from which the other classes most likely evolved), and Stenuroidea ...