Fossil echinoderms including the multiple, crowded edrioasteroids (IMAGE)

University of Tennessee at Knoxville

Fossil echinoderms including the multiple, crowded edrioasteroids

Caption

Fossil echinoderms—including the multiple, crowded edrioasteroids here (Euryeschatia reboulorum, Tiouririne Formation, Katian Anti-Atlas Range, Morocco, NHMUK EE 14803 specimen 10.4 cm long, photo by Samuel Zamora, published in Sumrall and Zamora, 2018; request permission to use here)—growing atop a conulariid in life position—have a rich and diverse fossil record. Independent comparisons of their morphology and ecology during the Cambrian and Ordovician radiations demonstrates that anatomical novelty arose more rapidly and evolved in a more volatile fashion that served as a prerequisite for later ecological innovation.

Credit

Photo by Samuel Zamora, published in Sumrall and Zamora, 2018

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