Brittlestars, aka ophiuroids, diverged in the Early Ordovician, about 500 million years ago.
Oct. 8, 2008 — Hundreds of new marine species and previously uncharted undersea mountains and canyons have been discovered in the depths of the Southern Ocean, Australian scientists said Wednesday.
A total of 274 species of fish, ancient corals, mollusks, crustaceans and sponges new [...]
