Note:  Do not rely on this information. It is very old.


Euechinoidea, the name of the sub-class of Echinoidea (q.v.) including all the Echinoids which have lived in and since Jurassic times, with some few representatives in earlier seas. The sub-class, though accepted for convenience, cannot be distinguished from the earlier "Palasechinoidea" by any satisfactory definition.