N.  Yamagiwa, Zavala}, C. {Rangel, de Divila}, E. {Villacice, and Kawabe, T., ?A new hexacoral species from the Upper Jurassic to Lower Cretaceous Yura Group at Cailloma, Arequipa Department, southern Peru?, Paleontological Studies of the Andes, vol. 2, pp. 41?46, 1981.