Pseudoceratium ludbrookii (Cookson and Eisenack, 1958) Eisenack, 1961; Emendation: Morgan, 1980, p.23, as Endoceratium ludbrookiae.

Now Endoceratium. Originally Ceratocystidiopsis, subsequently Pseudoceratium,
thirdly (and now) Endoceratium. Helby 1987 retained this species in Pseudoceratium; however, Lentin and Williams, 1989 retained it in Endoceratium Vozzhennikova, 1965.

Holotype: Cookson and Eisenack, 1958, pl.5, fig.7
Paratype: Cookson and Eisenack, 1958
Locus typicus: Cootabarlow, S Australia
Stratum typicum: Albian

Original description: Cookson and Eisenack, 1958, p. 53: Ceratocystidiopsis ludbrookii
Theca approximating in outline to an isoceles triangle with convex sides, a rather blunt obliquely-directed apical horn and two divergent and somewhat unequal antapical horns with more pointed apices. The internal capsule is sub-trianguilar with a flat base, convex sides and a blunt apex and is seperated from the outer membrane by a space of cariable width. The wall of the internal body is finely granular, that of the outer membrane smooth. The apical region of the theca may become completely detached along an irregular line that extends obliquely across its upper portion.

Affinities:
Cookson and Eisneack, 1958, p. 54: Ceratocystidiopsis ludbrookii
Ceratocystidiopsis ludbrookii agrees in general features with C. molesta Defl. from the French Senonian, but differs from it both in size and shape.