IMS, University of California Santa Cruz, Santa Cruz, CA, United States Department of Paleobiology, Smithsonian Institution, Washington, CA, United States
Department of Paleobiology, National Museum of Natural History, Washington, DC, United States
University of Missouri Columbia, Columbia, MO, United States
Dipartimento di Scienze della Terra, Universita' degli Studi di Firenze, Firenze, Italy
UCSC-Inst Marine Sciences, Santa Cruz, CA, United States