Cassiduloida
| Cassiduloida Temporal range:
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| Order: | Cassiduloida L. Agassiz & Desor, 1847
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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.[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]
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 <small(Agassiz, 1869)
- family Eurhodiidae fam. nov.[1]
- 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, 1918a)
- family Pliolampadidae (Kier, 1962) †
References
- ^ a b c Camilla Souto; Rich Mooi; Luciana Martins; Carla Menegola; Charles R. Marshall (2019). "Homoplasy and extinction: the phylogeny of cassidulid echinoids (Echinodermata)". 2019 (3): 622–660. doi:10.1093/zoolinnean/zlz060.
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- 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.
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