Here are some pictures of Kloedenella sp. ostracods found in the Mifflintown Formation of Clinton County, Pennsylvania, U.S.A. The fossil dates to the Silurian Period (Wenlock Epoch, Homerian Stage). Thanks to Dave at the Views of the Mahantango blog for the specimens.
Find out more info about this genus in the book Microsfossils (2005) by Howard Armstrong and M.D. Brasier, Chapter 20 Ostracods pp.233-234.