Chen, X.-Y., Zhang, H.-C. and Yang, J.-Y. 2024. A new fossil species of Callipteris (Callipteridae) in the Early Permian from the Xishan Area in Beijing, North China. Phytotaxa. 641, 4 (Mar. 2024), 295–300. DOI:https://doi.org/10.11646/phytotaxa.641.4.6.