Okerisphaeridium fragile (Kunz, 1990, p.22–23, pl.4, figs.11a–b,12a–b,13,14a–b,15; text-figs.9a–c) Feist-Burkhardt and Monteil, 2001, p.62. Holotype: Kunz, 1990, pl.4, figs.11a–b; figs.11a–b; text-figs.9a–c. Originally Okerisphaeridium, subsequently (and now) Dissiliodinium. Age: late Oxfordian.

Original description: Kunz, 1990, p.22
Proximate, sphaeroidal to subsphaeroidal cyst with following areation formula ?pr, 4", 0a, 6"", 6c, 6""", 1p, 1"""", xs. Archaeopyle rsults from the loss of four precingular areas, archaeopyle formula 2""+3""+4""+5"". Operculum secate and solvate. Opercular formula 2""(s)+3""(s)+4""(s)+5""(s). Epi-/hypocyst of nearly equal size, divided by a strongly helicoidal cingulum (distance between ends c. 1¢ cingulum width). Antapical plate sexiform. Wall composed of pedium and luxuria. Surface ornamentation varying on specimens, on some specimens granulae only, on others granulae may be joined to irregular, short ridges. Sutures indicated by reduction of the surface ornamentation. No septa, processes or horns developed.
Dimensions: Holotype: 48 µm in diameter. Further specimens: 20: 42-54 µm in diameter, 47 µm in average.

Affinities:
Kunz, 1990, p.23: The most similar species is Dissiliodinium globulum which differs in lacking hypocystal areation, and an archaeopyle resulting from the loss of six precinglular areae. The observed loss of less than four precingular areae on some specimens of O. fragile can not be interpreted as archaeopyle forming but as a result of preperation.