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Gonyaulacysta ordocava
Gonyaulacysta ordocava Duxbury 1977
NOW Stanfordella. Originally Gonyaulacysta, subsequently Millioudodinium, thirdly (and now) Stanfordella.
Sarjeant, 1982, transferred this species to Millioudodinium Stover and Evitt, 1978.
Holotype: Duxbury, 1977, pl.1, figs.10,11, text-fig.12; Jan du Chene et al., 1986, pl.41, figs.1-2
Locus typicus: Speeton Clay, Speeton, England
Stratum typicum: Hauterivian
Original diagnosis: Duxbury, 1977, p.37-38
Endophragm thin, smooth to finely granular and produced into a distinct, rounded apical prominence. Periphragm thin, finely granular, produced into a short apical horn. Tabulation 4", 6", ?6""", 1"""", outlined by very distinctive sutural crests. These are low, distally entire and of constant hight. A regulary-spaced row of perforations each about one micron in diameter occurs in each crest.
Remark:
Duxbury, 1977, p. 38: This is a very distinctive though uncommon species and the regulary perforate sutural crests set it apart from all others. The thinness of the body walls and the overall test suggests some affinity with G. exsanguia.
NOW Stanfordella. Originally Gonyaulacysta, subsequently Millioudodinium, thirdly (and now) Stanfordella.
Sarjeant, 1982, transferred this species to Millioudodinium Stover and Evitt, 1978.
Holotype: Duxbury, 1977, pl.1, figs.10,11, text-fig.12; Jan du Chene et al., 1986, pl.41, figs.1-2
Locus typicus: Speeton Clay, Speeton, England
Stratum typicum: Hauterivian
Original diagnosis: Duxbury, 1977, p.37-38
Endophragm thin, smooth to finely granular and produced into a distinct, rounded apical prominence. Periphragm thin, finely granular, produced into a short apical horn. Tabulation 4", 6", ?6""", 1"""", outlined by very distinctive sutural crests. These are low, distally entire and of constant hight. A regulary-spaced row of perforations each about one micron in diameter occurs in each crest.
Remark:
Duxbury, 1977, p. 38: This is a very distinctive though uncommon species and the regulary perforate sutural crests set it apart from all others. The thinness of the body walls and the overall test suggests some affinity with G. exsanguia.