A Revision of the Genus Sanyuania Zhao and Han, 1980 Ostracoda, Crustacea) with the Description of New Species from the Late Cainozoic of China

Abstract. 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.