About the Authors
- Anne S. Schulp
- Natuurhistorisch Museum Maastricht, Maastricht, The Netherlands
- Mohammed Al-Wosabi
- Department of Geology, Sana'a University, Sana'a, Republic of Yemen
- Nancy J. Stevens
- Department of Biomedical Sciences, College of Osteopathic Medicine, Ohio University, Athens, Ohio, United States of America
The authors have declared that no competing interests exist.
Analyzed the data: NS AS. Contributed reagents/materials/analysis tools: NS AS MA. Wrote the paper: NS AS. Other: Participated in research and coordinated field logistics: MA.