cuneus (foram) cuneus (foram) cuneus is a genus of foraminifera in the rotaliida found in upper cretaceous (coniacian) to paleocene marine sediments throughout the boreal regions. cuneustemporal range: mid late cretaceous to paleocene scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria superphylum: retaria phylum: foraminifera order: rotaliida superfamily: turrilinacea family: turrilinidae genus: cuneusvoloshina, 1974 the test is pyramidal in form, triserial throughout, with a triangular section, and may be slightly twisted. the test wall is calcareous, transparent. and finely perforate, the surface smooth. sides are flat to slightly concave; sutures flush and oblique. the aperture is a narrow vertical loop on the apertural face of the final chamber.