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Sea urchins or urchins ( / ˈɜːrtʃɪnz /) 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] Their tests (hard shells) are round and spiny, typically from 3 to 10 cm (1 to 4 ...
Apr 16, 2024 · Learn about some of the most interesting species of sea urchins in the following sections. Read more: Sea Urchin Facts. 15 Types of Sea Urchins. Quick link to the different types of sea urchin species: 1. Red Sea Urchin. 2. Green Sea Urchin. 3. Pacific Purple Sea Urchin. 4. Pale Sea Urchin. 5. Black Sea Urchin. 6. Jewel Urchin. 7.
Apr 8, 2024 · hatpin urchin. long-spined sea urchin. Centrostephanus longispinus. (Show more) sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton).
- The Editors of Encyclopaedia Britannica
Sea urchins can be found in all of Earth’s oceans. Some species live between the high and low tide lines near the seashore. Others live in the deep ocean, mostly up to 5,000 metres below the surface. The deepest a sea urchin has ever been recorded at is 7,340 metres.
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Jul 29, 2020 · i. Sea urchins also have a hard mouthpiece called an Aristotle’s lantern. It’s named after the philosopher Aristotle, who described the urchin’s mouth as a “horn lantern” in his book The History of Animals. They have five calcium carbonate teeth that grind and scrape algae, plankton and kelp. Sea urchins plan an important role in the ...
Aug 22, 2015 · Sea Urchin Anatomy. One look at a sea urchin and you can see why they would be called sea hedgehogs. They have hard rounded shells covered with sharp movable spines. Urchins are part of the phylum Echinoderm and their name comes from Ancient Greek (echinos meaning "hedgehog" and derma meaning "skin").
Sea urchins inhabit the polar seas as well as the warm tropics. Distribution of the Sea Urchin. Sea urchins can inhabit nearly any ocean in the world. Sea urchins have even been found at depts greater than 6,850 meters! Diet of the Sea Urchin. Sea urchins mainly graze on algae and undersea vegetation, such as kelp.
