Cidaris blumenbachii Public domain scan of zoological print or book illustration, zoology, free to use, no copyright restrictions image - Picryl description
Cidaris glandiferus Public domain scan of zoological print or book illustration, zoology, free to use, no copyright restrictions image - Picryl description
Cidaris spec. Public domain scan of zoological print or book illustration, zoology, free to use, no copyright restrictions image - Picryl description
Cidaris vesiculosa Public domain scan of zoological print or book illustration, zoology, free to use, no copyright restrictions image - Picryl description
Cidaris blakei in the abyss off to Porto Rico.
See here for index to numbers. Cidaris tribuloïdes (Lamarck) = Cidaris tribuloides Lamarck, 1816, from below Cidaris baculosa (Lamarck) = Prionocidaris baculosa (Lamarck, 1816)?, mouth region of shell from bel More