Dichadogonyaulax cristata (Horowitz, 1975, p.25, pl.1, fig.8) Fensome and Sarjeant, 1982, p.56. Emendation: Wheeler and Sarjeant, 1990, p.306–307, as Dichadogonyaulax cristata. Holotype: Horowitz, 1975, pl.1, fig.8; Fensome et al., 1995, fig.1
— p.1479; lost according to Sarjeant (1988, p.177). Neotype: Wheeler and Sarjeant, 1990, pl.8, fig.4; text-figs.10a– b; Fensome et al., 1995, fig.1 — p.1479; designated by Wheeler and Sarjeant (1992, p.382). Originally Brotzenia, subsequently Ctenidodinium?, thirdly (and now) Dichadogonyaulax. Taxonomic senior synonym: Ctenidodinium ornatum, according to Woollam (1983, p.190) — however, Sarjeant (1988, p.180) retained Dichadogonyaulax cristata. Age: Late Triassic (probably not in place).

Original description (Horowitz, 1975) Not yet translated from French
Holotype: Slide P 426, Zohar 8 Well, depth 1893 m, Upper Triassic, Southern Israel.
Description: Identical to the genus.
Average dimensions: 10 x 50 l, 20 specimens.
Name origin: Based on the crested appearance of the cyst sutures.
Genus description: Diagnosis: Proximate dinoflagellate cyst. Ovoid to hemispherical, ellipsoidal shape. Clear, slightly helical equatorial cingulum. Very distinct tabulation, sutures bearing a crest approximately 4-5 l in width.
Note: Brotzenia is distinguished by its broad, low-lying shape. No other known genus of dinoflagellates appears to bear a close resemblance to it. Type species: Brotzenia cristata n.sp., Upper Triassic, Israel.