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Cribroperidinium nuciforme
Cribroperidinium nuciforme (Deflandre, 1938) Courtinat 1989
Originally Palaeoperidinium (name not validly published), subsequently Gonyaulax, thirdly Gonyaulacysta, fourthly Apteodinium, fifthly Millioudodinium, sixthly (and now) Cribroperidinium.
Taxonomic junior synonym: Palaeoperidinium nuciformoides, according to Sarjeant (1968, p.227). The name Palaeoperidinium nuciforme was not validly published in Deflandre (1939a) since the generic name Palaeoperidinium was not validly published until 1967.
Holotype: Deflandre, 1938, pl.8, fig.6; Jan du Chêne et al., 1986, pl.11, fig.1-3
Age: Oxfordian
Translation Courtinat, 1989: LPP
Remark: Courtinat, 1989, p.203
The holotype possesses a wall covered with small spines; the horn presents one lateral spine. The forms from the Jura vary between a spinous form, analogous to the holotype, and a form without spines. The horn itself is also of variable morphology. The paratabulation is completely corresponding with that of the genus Cribroperidinium. The wall structure is that of the genus Cribroperidinium. Sometimes one may observe a morphological gradation between Acanthaulax venusta and C. nuciforme.
Originally Palaeoperidinium (name not validly published), subsequently Gonyaulax, thirdly Gonyaulacysta, fourthly Apteodinium, fifthly Millioudodinium, sixthly (and now) Cribroperidinium.
Taxonomic junior synonym: Palaeoperidinium nuciformoides, according to Sarjeant (1968, p.227). The name Palaeoperidinium nuciforme was not validly published in Deflandre (1939a) since the generic name Palaeoperidinium was not validly published until 1967.
Holotype: Deflandre, 1938, pl.8, fig.6; Jan du Chêne et al., 1986, pl.11, fig.1-3
Age: Oxfordian
Translation Courtinat, 1989: LPP
Remark: Courtinat, 1989, p.203
The holotype possesses a wall covered with small spines; the horn presents one lateral spine. The forms from the Jura vary between a spinous form, analogous to the holotype, and a form without spines. The horn itself is also of variable morphology. The paratabulation is completely corresponding with that of the genus Cribroperidinium. The wall structure is that of the genus Cribroperidinium. Sometimes one may observe a morphological gradation between Acanthaulax venusta and C. nuciforme.