Best Echinoid
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Melonechinus is an extinct genus of echinoids, the group that includes sea urchins, known from Carboniferous fossil deposits. Its fossil remains represent the rigid test, or shell-like skeleton, of an ancient sea urchin rather than a living marine animal. The genus is studied in palaeontology as par...
Aeropsis fulva is a species of sea urchin in the family Aeropsidae and the order Spatangoida. The Ocean Biodiversity Information System lists its common name as the tawny heart sea urchin and places it within the genus Aeropsis. It is a taxonomic entry for a heart-urchin species, so the name is most...
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