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The ancient world of crinoids: Stunning photos of these flower-like fossils that are not flowers
Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults. They are very fragile and require specific ...
Nature20d
Crinosterol: a Unique Sterol from a Comatulid Crinoid
Fieser, L. F., and Fieser, M., Natural Products Related to Phenanthrene (third ed.), 204 (Reinhold, New York, 1949). Fieser, L. F., and Fieser, M., Steroids, 177 ...