Like all echinoderms, the Ophiuroidea possess a skeleton of calcium carbonate in the form of calcite.
2.
In Venezuela are five classes representatives living today : Crinoidea, Asteroidea, Ophiuroidea, Echinoidea and Holothuroidea.
3.
Extracellular endosymbionts are also represented in all four extant classes of Echinodermata ( Crinoidea, Ophiuroidea, Echinoidea, and Holothuroidea ).
4.
They are also known as serpent stars; the New Latin class name Ophiuroidea is derived from the Ancient Greek D ???, meaning " serpent ".
5.
Writing in 1872, Lutken suggested that in certain members of the Ophiuroidea, " a radiary division occurs in which cast off arms formed new rays and a disk ".
6.
""'Amphipholis " "'is a large genus of brittle stars ( Ophiuroidea ) found in oceans worldwide from tropics to Arctic and Antarctic regions.
7.
The Echinodermata are radially symmetric and exclusively marine, including starfish ( Asteroidea ), sea urchins, ( Echinoidea ), brittle stars ( Ophiuroidea ), feather stars ( Crinoidea ).
8.
Of all echinoderms, the Ophiuroidea may have the strongest tendency toward five-segment radial ( pentaradial ) starfish, in that ophiuroids have five arms joined to a central body disk.
9.
The "'Gnathophiurina "'are a group of Ophiuroidea mostly treated as suborder ( but at first as an order "'Gnathophiurida "', and sometimes as infraorder of Ophiurina or not used at all ).
10.
Several different melanins include melanoprotein ( dark brown melanin that is stored in high concentrations in the ink sac of the cuttlefish Sepia Officianalis ), echinoidea ( found in sand dollars, and the hearts of sea urchins ), holothuroidea ( found in sea cucumbers ), and ophiuroidea ( found in brittle and snake stars ).
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