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Rhynchodiniopsis transparens
Locus typicus: Cayton Bay, England
Statum typicum: Early Callovian
Original diagnosis: Sarjeant, 1959, p.334: Gonyaulax transparens
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 µm, breadth 55 µm, width of longitudinal furrow around 4 µm.
Affinities:
Sarjeant, 1959, p.334: Gonyaulax transparens
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.
Statum typicum: Early Callovian
Original diagnosis: Sarjeant, 1959, p.334: Gonyaulax transparens
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 µm, breadth 55 µm, width of longitudinal furrow around 4 µm.
Affinities:
Sarjeant, 1959, p.334: Gonyaulax transparens
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.