• Source: Cassiduloida

Cassiduloida is an order of sea urchins. The group was extremely diverse with many families and species during the Mesozoic, but today, only seven extant species remain.
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.




Description and characteristics


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.




List of families and genera


family Cassidulidae L. Agassiz and Desor, 1847
genus Cassidulus Lamarck, 1801
genus Paralampas Duncan & Sladen, 1882
genus Rhyncholampas Agassiz, 1869
family Eurhodiidae Souto et al., 2019
genus Australanthus Bittner, 1892
genus Eurhodia d'Archiac & Haime, 1853
genus Glossaster Lambert, 1918
genus Kassandrina Souto & Martins, 2018
family Faujasiidae Lambert, 1905
family Neolampadidae Lambert, 1918
family Pliolampadidae Kier, 1962 †
family Galeropygidae Lambert, 1911 †
genus Galeropygus Kier (1962) †
genus Eogaleropygus Kier (1962) †




References



Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.
National History Museum. "Cassiduloida". Retrieved 19 Dec 2009.
Kroh A, Mooi R (eds.). "Cassiduloida". World Echinoidea Database. World Register of Marine Species.

Kata Kunci Pencarian:

• Landak laut
• Dolar pasir
• Cassiduloida
• Sea urchin
• Eurhodia
• Cassidulus
• Irregularia
• Cassidulus caribaearum
• Rhyncholampas
• Hardouinia
• Cassidulus delectus
• Apatopygus recens