Best Cassiduloid
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Nucleolites scutatus is an extinct cassiduloid sea urchin described by Lamarck in 1816 and recognized by its compact, shield-like irregular test.
Hardouinia mortonis is an extinct cassiduloid sea urchin known from Maastrichtian rocks about 70 to 66 million years old in the southeastern United States.
Rhyncholampas caribaearum is a living cassiduloid sea urchin associated with the Caribbean and distinguished by a compact test with petaloid ambulacra.
Echinolampas depressa is a species of irregular sea urchin in the family Echinolampadidae, recognized for its flattened test and extensive fossil record.
Conolampas diomedeae is a deep-water echinolampadid sea urchin named by Alexander Agassiz and notable as the representative species of his 1883 genus.
Echinolampas sternopetala is an irregular sea urchin in the cassiduloid family Echinolampadidae, distinguished by its petal-shaped ambulacral areas.
Echinolampas ovata is a marine irregular sea urchin from the family Echinolampadidae that commonly inhabits the shallow waters of the Indo-Pacific Ocean.
Sandalia trituberculata is an irregular sea urchin distinguished by three prominent tubercular features referenced directly by its species name.
Anochanus sinensis is an unusual sea urchin described by Adolph Grube in 1868, notable for brooding young within a sac on its upper surface.
