Milliododinium confossum (Duxbury, 1977) Sarjeant, 1982

Now Cribroperidinium. Originally Gonyaulacysta, subsequently Millioudodinium, thirdly Cribroperidinium?, fourthly (and now) Cribroperidinium.
Holotype: Duxbury, 1977, pl. 2, fig. 3-4; Jan du Chêne et al., 1986, pl.19, fig.5
Paratype: Duxbury, 1977
Locus typicus: Speeton, England
Stratum typicum: Hauterivian

Original description: Duxbury, 1977, p. 33: Gonyaulacysta confossa
Diagnosis: A species of Gonyaulacysta with coarsely perforate test and a long apical horn (this typically measures half the main body length). The tabulation 4", 6"", 6""", 1p, 1pv, 1"""" is outlined by low periphragm crests which are delicate, proximally perforate and distally denticulate. Cingulum distinctly laevorotatory, archeopyle large and formed by detachment of plate 3"".
Dimensions: Holotype 159 x 95 Ám, Overall 173(135)108 x 113(92)76 Ám. 10 specimens measured.

Affinities:
Duxbury, 1977, p. 33
The coarsely perforate endophragm, long apical jorn and delicate sutural crests distinguish this species form all others.