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Tenua anaphrissa
Tenua anaphrissa (Sarjeant, 1966c, p.206, pl.22, fig.8; pl.23, fig.6; text-fig.55) Benedek, 1972, p.9–10. Emendation: Harding, 1990b, p.17–18, as Pseudoceratium anaphrissum
Now Pseudoceratium. Originally Doidyx, subsequently Tenua Eisenack, 1958, thirdly Aptea, fourthly (and now) Pseudoceratium. Harker and Sarjeant, 1975 retained this species in the genus Doidyx Sarjeant, 1966.
Holotype: Sarjeant, 1966, pl.22,fig.8; text-fig.55
Locus typicus: West Heslerton, Yorkshire, England
Stratum typicum: Early Barremian
Original diagnosis: Sarjeant 1966, p. 206-207: Doidyx anaphrissa
A Doidyx having a asymmetrical biconical shell with short, blunt apical horn and with low bump on antapex. Spines simple, capitate or briefly bifurcate. Portion thrown off in archaeopyle formation exceeding one-third of shell length.
Dimensions: Holotype-overall length 105 µm, breadth 118 µm; shell length 110 µm, breadth 102 µm; spines c. 7 µm long. Range of dimensions: overall lengths c. 120-145 µm, breadths c. 105-130 µm.
Original description: Sarjeant 1966, p. 206-207: Doidyx anaphrissum
This species is moderately abundant, some 25 specimens having been encountered; complete shells were infrequent, detached apices and shells lacking an apex being commoner. The shell is approximately club-shaped: its asymmetry is so pronounced that a longitudinal division would leave some 60% on one side, some 40% on the other. The epitract slopes smoothly into the apical horn; the hypotract is surmounted by an antapical bulge of small height and larger amplitude. The surface is very minutely granular. There is a dense cover of short spines, most often capitate, less frequently evexate, oblate, bifid or bifurcate: these sometimes suggest arrangement into lines, but no coherent pattern was determined. An equatorial belt of moderate breadth, corresponding to the cingulum, lacks spines: a sulcus is not distinguishable. The holotype shows fission to form an archaeopyle, which has however, not become detached. Its margin is distinctly angular, suggesting a tabulation pattern not otherwise indicated.
Now Pseudoceratium. Originally Doidyx, subsequently Tenua Eisenack, 1958, thirdly Aptea, fourthly (and now) Pseudoceratium. Harker and Sarjeant, 1975 retained this species in the genus Doidyx Sarjeant, 1966.
Holotype: Sarjeant, 1966, pl.22,fig.8; text-fig.55
Locus typicus: West Heslerton, Yorkshire, England
Stratum typicum: Early Barremian
Original diagnosis: Sarjeant 1966, p. 206-207: Doidyx anaphrissa
A Doidyx having a asymmetrical biconical shell with short, blunt apical horn and with low bump on antapex. Spines simple, capitate or briefly bifurcate. Portion thrown off in archaeopyle formation exceeding one-third of shell length.
Dimensions: Holotype-overall length 105 µm, breadth 118 µm; shell length 110 µm, breadth 102 µm; spines c. 7 µm long. Range of dimensions: overall lengths c. 120-145 µm, breadths c. 105-130 µm.
Original description: Sarjeant 1966, p. 206-207: Doidyx anaphrissum
This species is moderately abundant, some 25 specimens having been encountered; complete shells were infrequent, detached apices and shells lacking an apex being commoner. The shell is approximately club-shaped: its asymmetry is so pronounced that a longitudinal division would leave some 60% on one side, some 40% on the other. The epitract slopes smoothly into the apical horn; the hypotract is surmounted by an antapical bulge of small height and larger amplitude. The surface is very minutely granular. There is a dense cover of short spines, most often capitate, less frequently evexate, oblate, bifid or bifurcate: these sometimes suggest arrangement into lines, but no coherent pattern was determined. An equatorial belt of moderate breadth, corresponding to the cingulum, lacks spines: a sulcus is not distinguishable. The holotype shows fission to form an archaeopyle, which has however, not become detached. Its margin is distinctly angular, suggesting a tabulation pattern not otherwise indicated.