"A fairly thick-walled, distinctly bi-layered, proximo-cavate
dinoflagellate cyst species with smooth endo- and periphragm. The body layers
are appressed except in an area including the paracingulum and those portions
of the pre- and postcingular series adjacent to it. Paratabulation of the formula
3', ?6'' ?6c, 5''', 1p.v., 1'''' is outlined by low parasutural crests. Gonal
areas bear short, trifurcate processes and, rarely, bifurcate parasutural ones
may be present. The archeopyle is single-paraplate precingular (3'')." -
From Duxbury (1983, p. 57-58).