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Carinacea
The infraclassis Carinacea includes most living species of regular sea urchin, and fossil forms going back as far as the Triassic. Taxonomy List of orders according to World Register of Marine Species : * Super-order Calycina ** Order Phymosomatoida † ** Order Salenioida * Super-order Echinacea ** Order '' Arbacioida'' (Gregory, 1900) ** Order '' Camarodonta'' (Jackson, 1912) ** Order '' Stomopneustoida'' (Kroh & Smith, 2010) ** Family '' Glyphopneustidae'' Smith & Wright, 1993 † * Family Hemicidaridae Wright, 1857 † * Family Orthopsidae Duncan, 1889 † * Family Pseudodiadematidae Pomel, 1883 † Image:Phymosoma.jpg, '' Phymosoma granulosum'' ( Phymosomatoida) Image:Salenocidaris hastigera.png, '' Salenocidaris hastigera'' (Salenioida) Image:Arbacia lixula (oursin noir).JPG, '' Arbacia lixula'' ( Arbacioida) Image:Paracentrotus lividus Banyuls.jpg, ''Paracentrotus lividus'' ( Camarodonta) Image:S. variolaris.jpg, '' Stomopneustes variolaris'' ( Stomopneustoida) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Urchin
Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of sea urchins are round and spiny, ranging in diameter from . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals. Sea urchins are also used as food especially in Japan. Adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to the pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
