Echinoida is an order of sea urchins in the class Echinoidea. 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.

Order Echinoida

• family Echinidae Gray, 1825
• family Echinometridae Gray, 1825
• family Parasaleniidae
• family Strongylocentrotidae Gregory, 1900

• 
  Paracentrotus lividus (Echinidae)
• 
  Echinometra lucunter (Echinometridae)
• 
  Strongylocentrotus franciscanus (Strongylocentrotidae)

• Colobocentrotus atratus - Shingle urchin
• Echinus acutus - White sea urchin
• Echinus esculentus - Common sea urchin
• Echinus tylodes
• Evechinus chloroticus - New Zealand sea urchin
• Heterocentrotus mammillatus - Red pencil urchin
• Heterocentrotus trigonarius - Slate pencil urchin
• Loxechinus albus - Chilean sea urchin

• Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.
• National History Museum. "Echinoida". Retrieved 19 Dec 2009.