Best Cidaroida
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Phyllacanthus irregularis is a marine pencil urchin found in the coastal waters of Australia, notable for its thick, heavily armored, club-like spines that deter potential predators.
Ctenocidaris spinosa is a species of deep-sea cidaroid sea urchin noted for its prominent spines, primarily native to the cold waters of Antarctica.
Hesperocidaris panamensis is a pencil urchin native to the eastern Pacific Ocean, distinguished by its thick primary spines and its localized distribution within the Gulf of California.
Cidaris abyssicola is a deep-water cidaroid sea urchin known from abyssal depths in the Atlantic Ocean, notable for its prominent primary spines.
Psychocidaris ohshimai is a cidaroid sea urchin described from the western Pacific Ocean and named in honor of a Japanese researcher.
