Long-term trends in the abundance of unionids in the western basin of Lake Erie were examined from data collected at 17 stations in 1961, 1972, and 1982. The mean number of unionids at these stations declined over this time period, decreasing from 10 m~2 in 1961, to 6 m~2 in 1972, down to 4 m~2 in 1982. This decline in abundance was reflected in the decrease in the number of stations where muss...

A total of 17 species of the Fannia postica-group Chillcott, 1961 from the Palearctic and Oriental regions are reviewed herein, 2 of which are described from China as new: Fannia ningxiaensis Wang & Zhang, sp. n. and Fannia subaethiops Wang & Zhu, sp. n.. Fannia labidocerca Feng & Xue, 2006, originally placed in Fannia serena-group Chillcott, 1961, is moved to the postica-group and re-described...