Sea urchin - Wikipedia
WebAbout 950 species of sea urchin are distributed on the seabeds of every ocean and inhabit every depth zone from the intertidal seashore down to 5,000 meters (16,000 ft; 2,700 fathoms). The spherical, hard shells of sea urchins are round and covered in spines.
Sea urchin | Description, Anatomy, & Facts | Britannica
WebApr 8, 2024 · 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).
Urchin Definition & Meaning - Merriam-Webster
Web1. archaic : hedgehog sense 1a. 2. : a mischievous and often poor and raggedly clothed youngster. street urchins. 3. : sea urchin. Synonyms. devil. hellion. imp. mischief. …
Urchin | echinoderm | Britannica
Websea 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 …
Sea Urchin - Description, Habitat, Image, Diet, and Interesting Facts
WebThese 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.
Sea urchins: Strange and spiny wonders of the ocean
WebThe 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.
Sea Urchin: The Marine Invertebrate - Ocean Info
WebSea 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.
Sea Urchins - National Geographic
WebNov 12, 2009 · Visually arresting, hazardous to swimmers, and—to some cultures—delicious, sea urchins are also revealing new information to the scientists who study them. Here, red sea urchins carpet a kelp ...
Urchin - Facts and Beyond | Biology Dictionary
WebLast Updated: October 24, 2020. The sea urchin refers to a group of about 950 species of spiny, round, marine invertebrates of the class Echinoidea. They can be found on the seafloor throughout the world's oceans from the intertidal zone …
World Echinoidea Database - World Register of Marine Species
Web2 days ago · Echinoids, or sea urchins (oursins [French], Seeigel [German], erizos de mar [Spanish]) constitute a group of exclusively marine invertebrates inhabiting the intertidal down to the deep-sea trenches. They are characterized by a globose or flattened skeleton known as a test.
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