1 Hardouinia kellumi, periprocte, Maastrichtien, Peedee formation, carriere de Rock Point, Caroline du nord, 60mm
2 Hardouinia kellumi, vue apicale, Maastrichtien, Peedee formation, carriere de Rock Point, Caroline du nord, 60mm
3 Hemicidaris hoffmanni, Kimmeridgien, Kalkriese, Allemagne, 20mm
4 Temnocidaris hardwicki, Pleistocene, Kioroshi formation, Inashiki gun, Ibaragi, Japon, 50mm
Temnopleurus hardwicki, Pleistocene, Kioroshi formation, Inashiki gun, Ibaragi, Japon, 50mm
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