SEM Photograph: (Bold, 1988, pl. 5, fig. 8) Scale is ? mm. Image is of HVH No. 10562 (Locality NMB 16964). Left valve.
Morphologic Description: Small with irregular pustules, one is prominent about one-fourth of the length from the posterior, just above the ventral margin (Bold, 1988).
Holotype: HVH No. 8364 (Locality H 15211, Río Mao, Gurabo Formation. Pliocene.)