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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
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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.
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oral surface. They have no lantern as adults, and the petaloids are poorly developed or absent.
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Camilla Souto; Rich Mooi; Luciana
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377:"Homoplasy and extinction: the phylogeny of cassidulid echinoids (Echinodermata)"
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452:World Register of Marine Species
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212:Description and characteristics
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729:. You can help Knowledge by
165:L. Agassiz & Desor, 1847
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299:d'Archiac & Haime, 1853
221:List of families and genera
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407:Barnes, Robert D. (1982).
231:L. Agassiz and Desor, 1847
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448:World Echinoidea Database
426:National History Museum.
394:10.1093/zoolinnean/zlz060
321:Souto & Martins, 2018
253:Duncan & Sladen, 1882
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101:Scientific classification
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442:Kroh A, Mooi R (eds.).
30:Lower Jurassic–Holocene
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409:Invertebrate Zoology
16:Order of sea urchins
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731:expanding it
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143:Superorder:
24:Cassiduloida
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590:iNaturalist
497:Wikispecies
329:Faujasiidae
317:Kassandrina
272:Eurhodiidae
199:sea urchins
770:Categories
723:sea urchin
357:References
350:Kier, 1962
306:Glossaster
249:Paralampas
238:Cassidulus
136:Echinoidea
171:Families
107:Kingdom:
488:Q3199468
482:Wikidata
295:Eurhodia
203:Mesozoic
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112:Animalia
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677:uBio:
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641:NZOR:
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433:19 Dec
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314:genus
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193:is an
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688:WoRMS
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608:12475
603:IRMNG
556:8VR37
543:82708
195:order
727:stub
629:NCBI
616:ITIS
577:GBIF
569:1974
538:BOLD
435:2009
413:ISBN
385:2019
35:PreꞒ
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564:EoL
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389:doi
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45:O
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