Globivalvulinid foraminifers recovered from the Upper Mississippian Menard Limestone in southern Illinois are herein described as a new genus and species, Pseudobiseriella menardensis. The taxon, although morphologically similar to its likely precursor Biseriella, contains an agglutinated-micro-granular wall structure in contrast to the completely micro-granular wall found in the latter genus. Including P. kipshakensis, the other species assigned herein to the genus, Pseudobiseriella occurrences thus far are limited to Upper Mississippian locations in North America and Kazakhstan.