Echinolampadidae Neolampadidae Cassiduloida is an order of sea urchins.
[1] A 2019 phylogenetic systematics study by Souto et al. presented a revised classification of the cassiduloids, and hypothesised that the order probably originated in the Early Cretaceous.
[1] Cassiduloids have a rounded or slightly oval appearance, and look somewhat similar to heart urchins, although they are actually more closely related to the sand dollars.
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 as adults, and the petaloids are poorly developed or absent.