Diagnosis_Genus: Probert et Siano. Photosynthetic dinoflagellate. Motile cells covered by 6 series of thecal plates: 3 in the epitheca, 2 in the hypotheca (including single antapical plate), and 1 in the cingulum. One transverse and one longitudinal flagellum. Large nucleus located in central part of cell. One or two peripheral chloroplasts, golden-yellow in color. One or two large circular pyrenoids.

Diagnosis_Species: Probert et Siano. Plate tabulation: Po, X, 40, 3a, 7″, 5c, 4s, 5‴, 1″″. Epitheca larger than hypotheca. Epitheca convex conical with well-pronounced apical horn. Hypotheca rounded. Wide and shallow cingulum located in the median portion of the cell, displaced by a small fraction of its own width. Sulcal area with 4 plates, one of which forms a wing-like flange over the median part of the sulcus. Single antapical plate. Cells on average 13.1 lm in length by 10.4 lm in width. Symbiont of polycystine radiolarians.

Body_length: 10.5-15 µm
Body_wide: 9.1-11.2 µm