The endemic genus Sanyuania, one of the most important elements of the Cainozoic brackish water faunas unique to China, is redescribed, and 3 new species, S. wangi, S. cuneata and S. sublaevis are established, based on Quaternary material from the eastern coast of China. The evolution of the genus is discussed and a general trend involving a reduction in the strength of carapace ornamentation with time is established, as is a general migration seawards exhibited by subsequent chronological species.
- Received November 1, 1991.
- Accepted July 1, 1992.
- © 1992 The Micropalaeontological Society