SEM Photograph: (Bold, 1988, pl. 11, fig. 18) Scale is 0.01 mm. Specimen HVH 10700 (NMB Locality 15978: Río Gurabo, Dominican Republic, Gurabo Formation). Right valve. Height: 0.29 mm; length: 0.53 mm.
Morphologic Description: A species with a deep, vertical, median sulcus and surface covered with a network of fossae.
Holotype: HVH 10700 (Locality: NMB 15978, Río Gurabo, Gurabo Formation, Dominican Republic. Pliocene).