1. Department of Biological Sciences, LSCB 124, University of South Alabama, Mobile, Alabama 36688 USA;
2. Division of Paleobotany, Natural History Museum and Biodiversity Research Center, Lawrence, Kansas 66045 USA;
3. Bayerische Staatssammlung für Paläontologie und Geologie, Funktionseinheit Paläontologie, Richard‐Wagner‐Straße 10, 80333 Munich, Germany;
4. Department of Ecology and Evolutionary Biology and Natural History Museum and Biodiversity Center, University of Kansas, Lawrence, Kansas 66045 USA;
5. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 205609 USA