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Gonyaulax transparens
Gonyaulax transparens Sarjeant, 1959
NOW Gonyaulacysta?. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Gonyaulacysta?.
Holotype: Sarjeant, 1959, pl.13, fig.3
Locus typicus: Cayton Bay, England
Statum typicum: Macrocephalites macrocephalus-Zone, Early Callovian
Original diagnosis: Sarjeant, 1959, p.334
A species of fossil dinoflagellate having an ovaltheca with a very small apical horn and the tabulation 3", 6", 1a, 6""", 2p, 1pv, 1"""". Thecal walls very thin and transparent: sutures devoid of ornamentation.
Dimensions: Type length 60 Ám, breadth 55 Ám, width of longitudinal furrow around 4 Ám.
Affinities:
Sarjeant, 1959, p.334: The species has been tentatively related to Gonyaulax, to which it corresponds in general tabulation but from which it differs in the possession of two posterior intercalary plates instead of one. No other fossil species has this character: the most generally similar is G. pachyderma, from the Oxfordian of France (Deflandre), but this differs also from ?G. transparens in its apical tabulation and in the possession of raised crests.
NOW Gonyaulacysta?. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Gonyaulacysta?.
Holotype: Sarjeant, 1959, pl.13, fig.3
Locus typicus: Cayton Bay, England
Statum typicum: Macrocephalites macrocephalus-Zone, Early Callovian
Original diagnosis: Sarjeant, 1959, p.334
A species of fossil dinoflagellate having an ovaltheca with a very small apical horn and the tabulation 3", 6", 1a, 6""", 2p, 1pv, 1"""". Thecal walls very thin and transparent: sutures devoid of ornamentation.
Dimensions: Type length 60 Ám, breadth 55 Ám, width of longitudinal furrow around 4 Ám.
Affinities:
Sarjeant, 1959, p.334: The species has been tentatively related to Gonyaulax, to which it corresponds in general tabulation but from which it differs in the possession of two posterior intercalary plates instead of one. No other fossil species has this character: the most generally similar is G. pachyderma, from the Oxfordian of France (Deflandre), but this differs also from ?G. transparens in its apical tabulation and in the possession of raised crests.