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233:. They are distinguished from other sea urchins by their irregular shape and the absence of a feeding lantern. The group includes the well known
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312:. Philadelphia, PA: Holt-Saunders International. p. 981.
237:, as well as some less familiar and extinct forms.
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278:(Durham & Melville, 1957)
529:. You can help Knowledge by
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308:Barnes, Robert D. (1982).
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333:World Echinoidea Database
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119:Scientific classification
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327:Kroh A, Mooi R (eds.).
16:Suborder of sea urchins
111:Echinocardium cordatum
521:This article about a
475:Paleobiology Database
30:Lower Jurassic–recent
310:Invertebrate Zoology
581:Animal superorders
287:(L. Agassiz, 1840)
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388:Atelostomata
358:Atelostomata
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275:Holasteroida
266:Disasteridae
257:Collyritidae
248:Acrolusiidae
227:Atelostomata
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213:Holasteroida
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196:Atelostomata
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192:Superorder:
182:Infraclass:
176:Euechinoidea
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24:Atelostomata
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382:Wikispecies
296:Mintz, 1968
293:Tithoniidae
284:Spatangoida
251:Mintz, 1968
231:sea urchins
217:Spatangoida
186:Irregularia
576:Echinoidea
570:Categories
523:sea urchin
302:References
269:Gras, 1848
172:Subclass:
166:Echinoidea
291:Family †
264:Family †
255:Family †
246:Family †
142:Kingdom:
136:Eukaryota
367:Wikidata
152:Phylum:
146:Animalia
132:Domain:
415:2773103
373:Q378385
206:Orders
162:Class:
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480:151093
467:732553
428:158035
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282:order
273:order
525:is a
488:WoRMS
454:35063
527:stub
449:NCBI
423:ITIS
314:ISBN
225:The
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410:EoL
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90:N
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40:Ꞓ
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