Echinoida is an
order of sea urchins in the
class Echinoidea
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) ...
. They are distinguished from other sea urchins by simultaneously possessing both an un-sculpted test and a feeding lantern with large plates fused across the top of each pyramid.
Taxonomy
Order Echinoida
* family
Echinidae Gray, 1825
* family
Echinometridae Gray, 1825
* family
Parasaleniidae
* family
Strongylocentrotidae Gregory, 1900
Image:Paracentrotus lividus profil.JPG, ''Paracentrotus lividus
''Paracentrotus lividus'' is a species of sea urchin in the family Parechinidae commonly known as the purple sea urchin. It is the type species of the genus and occurs in the Mediterranean Sea and eastern Atlantic Ocean.
Description
''Paracent ...
'' ( Echinidae)
Image:Echinometra lucunter.jpg, '' Echinometra lucunter'' ( Echinometridae)
Image:Urchinhand 300.jpg, '' Strongylocentrotus franciscanus'' ( Strongylocentrotidae)
See also
*''
Colobocentrotus atratus
''Colobocentrotus atratus'', the helmet urchin or shingle urchin, is a species of sea urchin in the family Echinometridae. In Hawaii it is known as "hāʻukeʻuke." It is found on wave-swept intertidal shores in the Indo-West Pacific, particular ...
'' - Shingle urchin
*''
Echinus acutus'' - White sea urchin
*''
Echinus esculentus'' - Common sea urchin
*''
Echinus tylodes''
*''
Evechinus chloroticus
Kina (''Evechinus chloroticus'') is a sea urchin endemic to New Zealand. This echinoderm belongs to the family Echinometridae and it can reach a maximum diameter of 16–17 cm.
Kina have been a traditional component of Māori diet since pr ...
'' - New Zealand sea urchin
*''
Heterocentrotus mammillatus'' - Red pencil urchin
*''
Heterocentrotus trigonarius'' - Slate pencil urchin
*''
Loxechinus albus
''Loxechinus albus'' is an echinoderm of the family Parechinidae, native to coastal southern South America, ranging from Ecuador, along the entire coasts of Peru and Chile, to Argentina, as well as the Falkland Islands. It is the only species in ...
'' - Chilean sea urchin
References
*
*
Extant Late Cretaceous first appearances
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