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Deflandrea convexa
From Fensome et al., 2019:
Deflandrea convexa Wilson, 1988, p.17, pl.6, figs.3–5. Holotype: Wilson, 1988, pl.6, fig.5; Fensome et al., 1996, fig.3 —
p.2093. Age: Middle Eocene.
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Original description: Wilson, 1988, p. 17
Pericyst intermediate to large, ovoidal, elliptical to almost circular in dorso-ventral view with a subrounded apex and a broadly convex antapical margin lacking horns. Surface finely reticulate 1-1.5 µm thick. Paracingulum may be defined by lineation of reticulum; on other specimens it is not seen. Parasulcus defined by narrow smooth area on ventral surface of some specimens. Endocyst circular, smooth, slightly thicker walled than pericyst (2-3 µm). Narrow pericoels (length up to 12 µm) are developed only at the apex and antapex. Intercalary archeopyle broad (width 37-42 µm), hexagonal; operculum free and comprises two adherent pieces from periphragm and endophragm.
Dimensions: Holotype: overall length 93 µm, breadth 76 µm, length of endocyst 76 µm, breadth 76 µm. Range: overall length 78 (90) 103 µm, breadth 71 (76) 83 µm, diameter of endocyst 69 (77) 85 µm (n= 10).
Affinities:
Wilson, 1988, p. 17: The species has some resemblance to D. truncata Stover and D. Ieptodermata Cookson & Eisenack and is distinguished from them by its more rounded, convex antapex, and its reticulate periphragm. It is further distinguished from D. truncata by its shorter apical pericoel.
Deflandrea convexa Wilson, 1988, p.17, pl.6, figs.3–5. Holotype: Wilson, 1988, pl.6, fig.5; Fensome et al., 1996, fig.3 —
p.2093. Age: Middle Eocene.
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Original description: Wilson, 1988, p. 17
Pericyst intermediate to large, ovoidal, elliptical to almost circular in dorso-ventral view with a subrounded apex and a broadly convex antapical margin lacking horns. Surface finely reticulate 1-1.5 µm thick. Paracingulum may be defined by lineation of reticulum; on other specimens it is not seen. Parasulcus defined by narrow smooth area on ventral surface of some specimens. Endocyst circular, smooth, slightly thicker walled than pericyst (2-3 µm). Narrow pericoels (length up to 12 µm) are developed only at the apex and antapex. Intercalary archeopyle broad (width 37-42 µm), hexagonal; operculum free and comprises two adherent pieces from periphragm and endophragm.
Dimensions: Holotype: overall length 93 µm, breadth 76 µm, length of endocyst 76 µm, breadth 76 µm. Range: overall length 78 (90) 103 µm, breadth 71 (76) 83 µm, diameter of endocyst 69 (77) 85 µm (n= 10).
Affinities:
Wilson, 1988, p. 17: The species has some resemblance to D. truncata Stover and D. Ieptodermata Cookson & Eisenack and is distinguished from them by its more rounded, convex antapex, and its reticulate periphragm. It is further distinguished from D. truncata by its shorter apical pericoel.