1. [Research Associate, Section of Invertebrate Paleontology, Carnegie Museum of Natural History] Department of Earth Sciences, Kent State University at Stark North Canton, Ohio 44720
2. [Research Associate, Section of Invertebrate Paleontology, Carnegie Museum of Natural History] Department of Earth Sciences, Kent State University Kent, Ohio 44242
3. Instituto de Investigación en Paleobiología y Geología Universidad Nacional de Río Negro, General Roca Río Negro, Argentina