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Gonyaulax nuciformis
Gonyaulax nuciformis (Deflandre, 1938) Sarjeant, 1962
Now Cribroperidinium. Originally Palaeoperidinium, 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, 1986, pl.11, figs.1-3
Locus typicus:
Stratum typicum: Oxfordian
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 Ám, breadth 50-64 Ám: the specimens are more generally spheroidal than those whose dimensions are quoted by Deflandre length 60-65 Ám, breadth 47-53 Ám.
Now Cribroperidinium. Originally Palaeoperidinium, 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, 1986, pl.11, figs.1-3
Locus typicus:
Stratum typicum: Oxfordian
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 Ám, breadth 50-64 Ám: the specimens are more generally spheroidal than those whose dimensions are quoted by Deflandre length 60-65 Ám, breadth 47-53 Ám.