The dawn of animal skeletogenesis: ultrastructural analysis of the Ediacaran metazon Corumbella werneri - Warren, Lucas; Pacheco, Mírian Liza Alves Forancelli; Fairchild, Thomas R.; Simões, Marcello Guimarães; Riccomini, Claudio; Boggiani, Paulo César; Cáceres, A. A. (Geology, 2012)