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Cribroperidinium nuciforme
From Fensome et al., 2019:
Cribroperidinium nuciforme (Deflandre, 1939a, p.180, pl.8, figs.4–6 ex Sarjeant, 1962a, p.482–483) Courtinat, 1989, p.203. Holotype: Deflandre, 1939a, pl.8, fig.6; Jan du Chêne et al., 1986a, pl.11, figs.1–3. Originally Palaeoperidinium (name not validly published), subsequently Gonyaulax (Appendix B), 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. Age: Oxfordian.
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Supplemental diagnosis: Sarjeant, 1962, p.482
A species of fossil Gonyaulax having a spheroidal to ovoidal theca, thick walled and very coarsely granular, the granules in some cases so large as to be better regarded as very short spines. Tabulation ?4', 1a, 6'', 6''', 1p, 1'''' extremely difficult to determine, since the sutural crests areverylow and masked by the surface ornament. The apical process is short and broad, bifurcating briefly and giving rise to a short terminal process.
Dimenisons: (Melton specimens) overall length 56-58 µm, breadth 50-64 µm: the specimens are more generally spheroidal than those whose dimensions are quoted by Deflandre length 60-65 µm, breadth 47-53 µm.
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.
Cribroperidinium nuciforme (Deflandre, 1939a, p.180, pl.8, figs.4–6 ex Sarjeant, 1962a, p.482–483) Courtinat, 1989, p.203. Holotype: Deflandre, 1939a, pl.8, fig.6; Jan du Chêne et al., 1986a, pl.11, figs.1–3. Originally Palaeoperidinium (name not validly published), subsequently Gonyaulax (Appendix B), 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. Age: Oxfordian.
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Supplemental diagnosis: Sarjeant, 1962, p.482
A species of fossil Gonyaulax having a spheroidal to ovoidal theca, thick walled and very coarsely granular, the granules in some cases so large as to be better regarded as very short spines. Tabulation ?4', 1a, 6'', 6''', 1p, 1'''' extremely difficult to determine, since the sutural crests areverylow and masked by the surface ornament. The apical process is short and broad, bifurcating briefly and giving rise to a short terminal process.
Dimenisons: (Melton specimens) overall length 56-58 µm, breadth 50-64 µm: the specimens are more generally spheroidal than those whose dimensions are quoted by Deflandre length 60-65 µm, breadth 47-53 µm.
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.