A = Ventral view with girdle and sulcus and view on nucleus (=arrowheads); B = Cell at two focal planes; C = Dorsal view; D = Striation; E = Nucleus (=arrow) with "peripheral vacuolate zone" (DIC)
Size: Length 124-158 µm, width 52-80 µm.
Distinctive features: Girdle displaced, with many red inclusions, peculiar nucleus, striation
Distribution: California, Skagerrak
Kofoid, C. A. & Swezy, O. 1921. The free-living unarmored Dinoflagellata. Mem.Univ.California., 5: pp 562.