Figure 5.18-5.20. Uvigerina basicordata Cushman and Renz, 1941. 5.18. Side view. Holotype. Early Miocene. From the Lower Agua Salada Formation, Tocuyo, 18.7 km S (202˚45’) of San Juan de los Cayos, District of Acosta, State Falcon, Venezuela. Smithsonian Collection. CC 35924. Scale Bar = 114 microns. 5.19. Side view. Early Miocene. Eureka borehole E68-151A, 4588', Gulf of Mexico. Scale Bar = 137 microns. 5.20. Apertural view of specimen 19. Scale Bar = 132 microns.