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Sea Urchin - Wikipedia, the free encyclopedia
ea urchins or urchins, archaically called sea hedgehogs, are small, spiny, globular animals that, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum.
https://en.wikipedia.org/wiki/Sea_urchin
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Red Sea Urchins, Mesocentrotus franciscanus - MarineBio
Find out what's known about Red Sea Urchins, Mesocentrotus franciscanus, Echinoidea, Camarodonta, Strongylocentrotidae, including their world range and habitats, feeding behaviors, life history, ecology, reproduction, and conservation status.
http://marinebio.org/species.asp?id=45
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Sea Urchin (Echinoidea) - A-Z Animals
The sea urchin in found across the ocean floors worldwide, but rarely in the colder, polar regions. Sea urchins are commonly found along the rocky ocean floor in both shallow and deeper water and sea urchins are also commonly found inhabiting coral reefs.
http://a-z-animals.com/animals/sea-urchin/
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Edible Sea Urchin - Echinus esculentus - ARKive
Learn more about the Edible sea urchin - with amazing Edible sea urchin videos, photos and facts on ARKive
http://www.arkive.org/edible-sea-urchin/echinus-esculentus/
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Photos of Sea Urchins - Echinoidea - RyanPhotographic
The sea urchins are other worldly-looking creatures. It seems to me that they belong to some exotic planet far-far-away.
http://www.ryanphotographic.com/echinoidea.htm
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BBC Nature - Sea Urchins - Videos, News and Facts
Sea urchins are a class of marine animals that live on the seabed or burrow into the sand.
http://www.bbc.co.uk/nature/life/Sea_urchin
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Sea Urchin Photos - National Geographic
See photos of sea urchins (including fire urchins, pencil-spined urchins, and more) in this oceans life photo gallery from National Geographic.
http://ocean.nationalgeographic.com/ocean/photos/sea-urchins
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What (and How) do Sea Urchins Eat?
Urchins feed primarily with a unique jaw-like structure known as Aristotle's lantern.
http://echinoblog.blogspot.com/2013/07/what-and-how-do-sea-urchins-eat-sea.html
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Purple Sea Urchin - Strongylocentrotus purpuratus - Monterey Bay Aquarium
A purple sea urchin's pin cushion appearance comes from its round inner shell, called a "test."Â The test is covered with pincers (pedicellariae), tube feet and purple spines that move on ball-and-socket joints.
http://www.montereybayaquarium.org/animal-guide/invertebrates/purple-sea-urchin
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Sea Urchin Facts For Kids
Sea urchins are easily recognized type of marine animals. They belong to the group of animals called echinoderms.
http://www.softschools.com/facts/animals/sea_urchin_facts/479
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Neognathostomata - Wikipedia, the free encyclopedia
They are distinguished from other sea urchins by their irregular shape and a highly modified feeding lantern. The group includes the well known sand dollars, as well as some less familiar and extinct forms.
https://en.wikipedia.org/wiki/Neognathostomata
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Irregularia - Wikipedia, the free encyclopedia
These particular sea urchins are distinguished from other sea urchins by their irregular shape : the anus and often even the mouth are no more at the two poles of the test, creating a bilateral symmetry instead of the classical 5-fold symmetry of echinoderms.
https://en.wikipedia.org/wiki/Irregularia
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Echinothurioida - Wikipedia, the free encyclopedia
Echinothurioida is an order of sea urchins in the class Echinoidea. Members of this order are distinguished from other sea urchins by the combination of a flexible test and hollow spines.
https://en.wikipedia.org/wiki/Echinothurioida
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Carinacea - Wikipedia, the free encyclopedia
The infraclassis Carinacea includes most living species of regular sea urchin, and fossil forms going back as far as the Triassic.
https://en.wikipedia.org/wiki/Carinacea
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Diadematoida - Wikipedia, the free encyclopedia
Diadematoida is an order of sea urchins. They are distinguished from other sea urchins by the fact that their spines are hollow, or at best have an open mesh at the core, and by the presence of ten buccal plates around the mouth. Their test can be either solid or flexible.
https://en.wikipedia.org/wiki/Diadematoida
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Cidaroida - Wikipedia, the free encyclopedia
Cidaroida is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea.
https://en.wikipedia.org/wiki/Cidaroida
