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Deflandrea convexa
Deflandrea convexa Wilson, 1988
Holotype: Wilson, 1988, pl.6, fig.5; Fensome et al., 1996, fig.3 — p.2093.
Locus typicus: Waipawa Section, Hawkes Bay, New Zealand
Stratum typicum: Middle Eocene, Porangan
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.
Holotype: Wilson, 1988, pl.6, fig.5; Fensome et al., 1996, fig.3 — p.2093.
Locus typicus: Waipawa Section, Hawkes Bay, New Zealand
Stratum typicum: Middle Eocene, Porangan
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.