Palaeohystrichophora multispina Deflandre and Cookson, 1955, p.257, pl.1, fig.5. Emendation: Morgan, 1977, p.127–128, as Diconodinium multispinum.

NOW Diconodinium. Originally Palaeohystrichophora, subsequently (and now) Diconodinium.
Taxonomic junior synonyms: Palaeohystrichophora (as Diconodinium) dispersum, according to Stover and Helby (1987a, p.103); Diconodinium pusillum, according to Morgan (1977, p.127) — however, Below (1981a, p.124) retained Diconodinium pusillum.

Holotype: Deflandre and Cookson, 1955, pl.1, fig.5; Morgan, 1977, pl.1, figs.la-b
Locus typicus: Gingin, W Australia
Stratum typicum: Santonian

Original description: Deflandre and Cookson, 1955, p.257
Theca biconical with an approximately median, straight, probably helicoidal girdle. The portion taken as the epitheca is terminated by a short truncate process, the hypotheca being prolonged into a short, stout point. The membrane, which shows no trace of plates, is entirely covered with short spines.
Dimensions: Length 56 µm, breadth 38 µm.

Extended diagnosis: Cookson and Eisenack, 1958, p. 38
The theca is broadly fusiform and has straight to convex sides; the "epitheca" is terminated by a shortly bifid process and the "hypotheca" by a sharply pointed spine. The transverse furrow is approximately equatorial but is covered by short, fine spines which are sometimes so small as to give the surface a granular appearance.
Dimensions: Range in new material - 62-100 µm x 43-71 µm.