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Sea urchins or urchins (/ ˈ ɜːr tʃ ɪ n z /) are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 ft; 2,700 fathoms). [1]
Brissus gigas, also known as the giant heart urchin, [1] is a species of sea urchins of the family Brissidae. Their armour is covered with spines. Their armour is covered with spines. Brissus gigas was first scientifically described in 1947 by H.B. Fell. [ 2 ]
Chondrocidaris gigantea, also known as the rough-spined urchin [2] or blade-tipped tiara-urchin, [1] [3] is a species of sea urchin of the family Cidaridae. Chondrocidaris gigantea was first scientifically described in 1863 by Alexander Agassiz .
Diadema antillarum, also known as the lime urchin, black sea urchin, or the long-spined sea urchin, [2] is a species of sea urchin in the family Diadematidae. This sea urchin is characterized by its exceptionally long black spines. It is the most abundant and important herbivore on the coral reefs of the western Atlantic and Caribbean basin.
Expert warns urchins vital to coral reef ecosystems now ‘functionally extinct’ in Red Sea
The Caribbean population of this sea urchin has seen two massive dieoffs in the last few decades, which could have lasting impacts on coral reefs. ... Giant statue of the Buddha in New Jersey ...
The red sea urchin (Mesocentrotus franciscanus) [1] is a sea urchin found in the northeastern Pacific Ocean from Alaska to Baja California. It lives in shallow waters from the low-tide line to greater than 280 m (920 ft) deep, [2] and is typically found on rocky shores sheltered from extreme wave action in areas where kelp is available. [3] [4]
Light from a remotely operated vehicle reveals a “huge” crowd of sea urchins, gathered in the dark roughly 1,350 feet below the surface, all wearing “hats,” made of debris, on the tops of ...