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Platycystidia diptera
Platycystidia diptera Cookson and Eisenack, 1960
Acritarch
Holotype: Cookson and Eisenack, 1960, pl.3, fig.22
Locus typicus: North of Gingin, Perth Basin, Australia
Stratum typicum: ?Late Albian-Cenomanian
Original description: Cookson and Eisenack, 1960, p.14
Shell four-sided, slightly longer than broad, with rounded angles, more or less undulate margins, and a short triangular "horn" situated to one side of the middle line. Capsule ellipsoidal, with rounded ends and a tiny beak at the anterior end, adjacent to the side of the apical "horn" where the opening of the shell takes place. Membrane of the shell smooth, very finely toothed at the margins and with a few granules on the surface of the "horn". Delicate lines can usually be seen in the membrane, extending on both sides from the region of the capsule about halfway to the margin.
Dimensions: Holotype: overall length 48 µm; breadth about 30 µm; capsule 38x11 µm. Range: 38x48 µm long; 28x33 µm broad; capsule 29-40 µmx10-17 µm.
Acritarch
Holotype: Cookson and Eisenack, 1960, pl.3, fig.22
Locus typicus: North of Gingin, Perth Basin, Australia
Stratum typicum: ?Late Albian-Cenomanian
Original description: Cookson and Eisenack, 1960, p.14
Shell four-sided, slightly longer than broad, with rounded angles, more or less undulate margins, and a short triangular "horn" situated to one side of the middle line. Capsule ellipsoidal, with rounded ends and a tiny beak at the anterior end, adjacent to the side of the apical "horn" where the opening of the shell takes place. Membrane of the shell smooth, very finely toothed at the margins and with a few granules on the surface of the "horn". Delicate lines can usually be seen in the membrane, extending on both sides from the region of the capsule about halfway to the margin.
Dimensions: Holotype: overall length 48 µm; breadth about 30 µm; capsule 38x11 µm. Range: 38x48 µm long; 28x33 µm broad; capsule 29-40 µmx10-17 µm.