Project 3801: X. Song, B. Ruthensteiner, M. Lyu, X. Liu, J. Wang, J. Han. 2021. Advanced Cambrian hydroid fossils (Cnidaria: Hydrozoa) extend the medusozoan evolutionary history. Proceedings of the Royal Society B: Biological Sciences. 288 (1944):20202939.
This project has 15 specimens.