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These sea urchins are called "heart urchins" due to their specific shape, looking like a heart when seen from below (more or less depending on the genus). The mouth is located between the two cheeks, and the anus is below the tip.
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308:Desor, in Agassiz & Desor, 1847
272:Desor, in Agassiz & Desor, 1847
227:Desor, in Agassiz & Desor, 1847
319:A. Agassiz & H.L. Clark, 1907b
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400:World Register of Marine Species
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180:Description and characteristics
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679:. You can help Knowledge by
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48:Scientific classification
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360:Echinocardium cordatum
40:Echinocardium cordatum
671:This article about a
612:Paleobiology Database
16:Family of sea urchins
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726:Spatangoida
524:iNaturalist
457:Wikispecies
342:Boehm, 1882
284:Desor, 1858
280:Hemipatagus
248:Cooke, 1942
238:Gagel, 1903
200:Araeolampas
174:Spatangoida
105:Spatangoida
24:Loveniidae
720:Categories
673:sea urchin
477:Loveniidae
463:Loveniidae
433:Loveniidae
385:References
268:Gualtieria
259:Gray, 1825
243:subfamily
215:Koch, 1885
159:Loveniidae
135:Loveniidae
115:Brissidina
111:Suborder:
95:Echinoidea
151:See text
71:Kingdom:
65:Eukaryota
448:Q1159474
442:Wikidata
234:Chuniola
131:Family:
81:Phylum:
75:Animalia
61:Domain:
304:Lovenia
223:Breynia
169:in the
145:Genera
101:Order:
91:Class:
643:123175
617:168541
604:531398
588:NZOR:
555:158127
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335:genus
323:genus
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301:genus
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252:genus
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220:genus
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197:genus
189:Genera
163:family
675:is a
638:WoRMS
625:Plazi
581:41318
537:IRMNG
529:61455
503:7NJJZ
490:82027
396:WoRMS
171:order
161:is a
677:stub
576:NCBI
550:ITIS
516:5603
511:GBIF
485:BOLD
563:NBN
498:CoL
472:AFD
165:of
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