Seamounts are undersea mountains (usually of volcanic origin) rising from the seafloor and peaking below sea level. Underwater mountains of heights above 1000 m are considered to be seamounts, those between 500-1000 m as knolls, and those below 500 m as hills. A seamount tall enough to break the sea surface is called an oceanic island, e.g., the islands of Hawaii, the Azores and Bermuda were all underwater seamounts at some point in the past.
Photo of a deep-sea rattail fish and seastar Courtesy of Lisa Levin/ONRSee More...
Bertrand Richer de Forges says that it is a new species of the Crustacean genus Neoglyphea. The Glypheides were well known from the Jurassic and Cretaceous periods and were supposed to be extinct at the Eocene (about 50 million years ago). They were recently rediscovered off the Lord Howe Rise in the South Pacific Ocean.
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