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Gonyaulax caytonensis
Gonyaulax caytonensis Sarjeant, 1959
NOW Meiourogonyaulax. Originally Gonyaulax (Appendix B), subsequently (and now) Meiourogonyaulax, thirdly Lithodinia.
Holotype: Sarjeant, 1959, pl.13, fig.1; text-fig.1
Locus typicus: Cayton Bay, England
Stratum typicum: Macrocephalites macrocephalus Zone, Early Callovian
Original diagnosis: Sarjeant, 1959, p.330
A species of fossil Gonyaulax having a sub-ovate theca, broader than long, with the tabulation ?4", 6", 6""", 1"""", and without a terminal horn. Longitudinal furrow widening at its posterior end. Sutures ornamented by high, irregularly perforate crests.
Dimensions: Type: length 52 Ám, breadth 60 Ám, height of crests around 5 Ám, width of transverse furrow around 5 Ám. The type is of about average dimensions there was some variation in size observable.
Affinities and Remark:
Sarjeant, 1959, p.332: Gonyaulax caytonensis differs markedly in tabulation and form of crests from all the fossil species so far described. It was referred to this genus despite the absence of aposterior intercalary plate since the tabulation corresponds to that of Diesing"s genus in all other respects and since several fossil species lacking a posterior intercalary plate are already included within the genus.
NOW Meiourogonyaulax. Originally Gonyaulax (Appendix B), subsequently (and now) Meiourogonyaulax, thirdly Lithodinia.
Holotype: Sarjeant, 1959, pl.13, fig.1; text-fig.1
Locus typicus: Cayton Bay, England
Stratum typicum: Macrocephalites macrocephalus Zone, Early Callovian
Original diagnosis: Sarjeant, 1959, p.330
A species of fossil Gonyaulax having a sub-ovate theca, broader than long, with the tabulation ?4", 6", 6""", 1"""", and without a terminal horn. Longitudinal furrow widening at its posterior end. Sutures ornamented by high, irregularly perforate crests.
Dimensions: Type: length 52 Ám, breadth 60 Ám, height of crests around 5 Ám, width of transverse furrow around 5 Ám. The type is of about average dimensions there was some variation in size observable.
Affinities and Remark:
Sarjeant, 1959, p.332: Gonyaulax caytonensis differs markedly in tabulation and form of crests from all the fossil species so far described. It was referred to this genus despite the absence of aposterior intercalary plate since the tabulation corresponds to that of Diesing"s genus in all other respects and since several fossil species lacking a posterior intercalary plate are already included within the genus.