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Echinothurioida


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(subclass Euechinoidea, superorder Diadematacea)

An order of regular echinoids that have flexible tests and compound ambulacral plates bearing three pairs of pores. The tubercles are non-crenulate. At the present day there are many abyssal forms. They first appeared in the Late Jurassic.

Subjects: Zoology and Animal Sciences.


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