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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).
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).
Everything you should know about the Sea Urchin. The Sea Urchin is a colorful sea creature that resembles a pincushin filled with needles.
Jan 28, 2024 · Sea urchins are small ocean creatures found around the world. They are covered in spikes and have a painful sting if you bump or step on one. Stings are often red and swollen and may cause...
Jul 29, 2020 · Sea urchins are further classified in the class Echinoidea, which includes the classic “sea urchins” you’re picturing now, as well as sand dollars and sea biscuits (of the non-equine variety). There are more than 900 species of sea urchins around the world from the shallows to the deep sea.
The most easily recognisable sea urchins are round, often brightly coloured and covered in sharp-looking spines. In fact, ‘urchin’ comes from an old word for hedgehog owing to their similar-looking spiky armour. However, there are more than 1,000 species of sea urchin, with varying characteristics.
May 27, 2024 · Sea urchins are small sea animals that have spherical shells called tests that are typically covered in spines similar to those of a porcupine. Very small tube-shaped feet among the spines help them move slowly along the ocean floor.
Sea urchins are small, spiny, globular animals that live in the sea. They are found in all oceans, from the tropics to the poles. Sea urchins are related to sand dollars, starfish, and sea cucumbers. They are important members of the marine ecosystem and are often used as a food source by humans.
Nov 12, 2009 · See photos of sea urchins (including fire urchins, pencil-spined urchins, and more) in this oceans life photo gallery from National Geographic.
A guide to the fascinating and strange creature that inhabits the sea bed - Discover Wildlife.
