1. Department of Geology, Pasadena City College, 1570 East Colorado Blvd., E-215, Pasadena, California 91106, USA
2. Department of Paleontology and Stratigraphy, University of Granada, Granada 18006, and Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Armilla 18100, Spain
3. Department of Geological Sciences, California State University, Northridge, California 91330-8266, USA
4. Research Associate, Invertebrate Paleontology Section, Natural History Museum of Los Angeles County, Los Angeles, California, 90007, USA
5. Department of Crystallography and Mineralogy, Complutense University of Madrid, and Institute of Geosciences, IGEO (UCM-CSIC), 28040 Madrid, Spain