Temporal range: Lower Jurassic–recent
|Echinolampas hemisphaericus MHNT|
L. Agassiz & Desor, 1847
Cassiduloids have a rounded or slightly oval appearance, and look somewhat similar to sand dollars, although they are actually more closely related to the heart urchins. They are distinguished from other sea urchins by the presence of smaller intervening areas between the main ambulacral areas on the oral surface. They have no lantern, and the petaloids are poorly developed or absent.
- Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.
- National History Museum. "Cassiduloida". Retrieved 19th Dec 2009.
- WoRMS. "Cassiduloida". In A. Kroh & R. Mooi. World Echinoidea Database. World Register of Marine Species.
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