SEM Photograph: (Bold, 1988, pl. 1, fig. 4) Scale is 0.09 mm. Specimen HVH 10483 (NMB Locality 16020: Río Gurabo, Basal Mao Formation). Left view of carapace. Height: 0.18 mm; width: 0.16 mm; length: 0.39 mm.
Morphologic Description: A species with a hook-like caudal process, especially well-developed in the right valve.
Holotype: HVH 10483 (Locality: NMB 16020, Río Gurabo Section, Basal Mao Formation).