Durham, J. W. & Melville, R. V. 1957. A classification of echinoids. Journal of Paleontology 31, 242-272.
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Durham, J. W.; Melville, R. V.
1957
A classification of echinoids
Journal of Paleontology
31: 242-272
Publication
from Kier & Lawson (1978)
The echinoids are divided into two subclasses--Perischoechinoidea, which includes all Paleozoic forms and the post-Paleozoic cidaroids, and Euechinoidea, which includes all remaining echinoids and is divided into four superorders (Diadematacea, Echinacea,