Ceratophysa ceratopyga valvaecristata
young specimen viewed from above. Specimen photographed after ethanol fixation. Reprinted from: Deep Sea Research Part II: Topical Studies in Oceanography, Vol. 111, Mironov A.N., Minin K.V., Dilman A.B., Abyssal echinoid and asteroid fauna of the North Pacific, Pages 357–375, Copyright (2014), with permission from Elsevier. 2014.