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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).
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.
Jul 29, 2020 · There are more than 900 species of sea urchins around the world from the shallows to the deep sea. Urchins live at depths of more than 24,000 feet. Hidden beneath their spines they have a hard, outer skeleton called a test.
These spiky little sea creatures are incredibly common throughout the world. They are slow moving creatures, which are commonly found in the intertidal zones of rocky shorelines. Sea urchins have a number of surprising traits to help keep them alive. Read on to learn about the sea urchin.
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.
Apr 16, 2024 · Characterized by vibrant hues, differing spike lengths, and even flattened shapes, this diversified group of marine animals offers much to explore. Read on to learn more about these echinoderms and how to identify the different types of sea urchins.
A guide to the fascinating and strange creature that inhabits the sea bed - Discover Wildlife.
Aug 4, 2021 · Learn How to Cook Sea Urchin in 5 Easy Steps. Written by MasterClass. Last updated: Aug 4, 2021 • 3 min read. Spiny on the outside, buttery on the inside, sea urchins are a Japanese delicacy gaining popularity in the US.
Aug 22, 2015 · There are more than 900 species of sea urchins and they come in a range of colors including purple, blue, brown, green, and red. If you look inside a sea urchin you will see there are some organs that are familiar, like the esophagus and intestine.
