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Trigonopyxidia fiscellata
From Fensome et al., 2019:
Trigonopyxidia fiscellata de Coninck, 1986b, p.20, pl.10, figs.13–18,22–25.
Holotype: de Coninck, 1986b, pl.10, figs.13–15.
Locus typicus: Woensdrecht borehole, S Netherlands
Stratum typicum: Tongrian (Rupelian)
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Original diagnosis: De Coninck, 1986, p.20
The pericyst has a concavely isocele triangular form with rounded corners. It is ornamented below the apical archeopyle with pronounced ridges marking the lateral and upper limits of a series of six precingular plates. This series is interrupted by a relatively narrow ventral strip. The ridges remind us of a muzzle (latin: fiscella -ae) around a snout. Apart from these ridges small dot-like thickenings are observed on the periphragm. The operculum is still attached to the ventral strip. The endocyst is ovoidal and relatively small.
Dimensions of the endocyst: Holotype: 22.5 µm long and 22.5 µm wide. Four other specimens: between 20 and 25 µm long and 20 to 25 µm wide. Dimensions of the pericyst: Holotype: 32.5 µm long, 15 µm wide at the top and 35 µm wide at the base. Four other specimens: 35 to 50 µm long; 15 to 20 µm wide at the top and 32 to 47 µm wide at the base.
Affinities:
De Coninck, 1986, p. 20: T. fiscellata differs from T. ginella (Cookson and Eisenack 1960) by the tabulation of the epitract between the cingular area and the apical archeopyle.
Trigonopyxidia fiscellata de Coninck, 1986b, p.20, pl.10, figs.13–18,22–25.
Holotype: de Coninck, 1986b, pl.10, figs.13–15.
Locus typicus: Woensdrecht borehole, S Netherlands
Stratum typicum: Tongrian (Rupelian)
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Original diagnosis: De Coninck, 1986, p.20
The pericyst has a concavely isocele triangular form with rounded corners. It is ornamented below the apical archeopyle with pronounced ridges marking the lateral and upper limits of a series of six precingular plates. This series is interrupted by a relatively narrow ventral strip. The ridges remind us of a muzzle (latin: fiscella -ae) around a snout. Apart from these ridges small dot-like thickenings are observed on the periphragm. The operculum is still attached to the ventral strip. The endocyst is ovoidal and relatively small.
Dimensions of the endocyst: Holotype: 22.5 µm long and 22.5 µm wide. Four other specimens: between 20 and 25 µm long and 20 to 25 µm wide. Dimensions of the pericyst: Holotype: 32.5 µm long, 15 µm wide at the top and 35 µm wide at the base. Four other specimens: 35 to 50 µm long; 15 to 20 µm wide at the top and 32 to 47 µm wide at the base.
Affinities:
De Coninck, 1986, p. 20: T. fiscellata differs from T. ginella (Cookson and Eisenack 1960) by the tabulation of the epitract between the cingular area and the apical archeopyle.