SEM Photograph: (Borne and Cronin, ms, pl. 4, fig. 8) Scale is 0.08 mm. (Locality: CJ-89-22-2: Río Banano Formation, Costa Rica.) Left valve, female.
Morphologic Description: Carapace small, elongate; surface having irregular ridges and tubercles forming broken ridges in medial and posterodorsal regions; posterodorsal denticles absent to weakly developed (Cronin, 1987).
Holotype: USNM 68007 (Locality: Rohr 12528, north of Mamural Road, Central Range, Gransaul Clay Member of Springvale Formation of Trinidad. Upper Miocene).