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Lanternosphaeridium doubingeri
From Fensome et al., 2019:
Lanternosphaeridium doubingeri Troncoso in Troncoso and Doubinger, 1980, p.103, pl.3, figs.7–9. Holotype: Troncoso and Doubinger, 1980, pl.3, figs.8–9. Age: Maastrichtian–Danian.
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Original description: [Troncoso and Doubinger, 1980] (translated from Spanish):
Lanternosphaeridium doubingeri Troncoso sp. n.
Plate 3, figs. 7, 8, and 9.
Diagnosis: Body generally elliptical, thick-walled. Punctate-fibrous surface with numerous processes of variable shape, size, and apex: simple, forked, or doubly forked. The apex of the processes is truncate or acute; the base of the processes is fibrous, of variable width. The processes are joined by ridges originating from the widening of these bases; sometimes the processes are perforated near the base.
The cyst exhibits clear bipolarity, indicated by the apical and antiapical processes being longer than the rest; the apical one is also wider.
The precingular archeopyle is separated from the apical process. The cingulum and sulcus are sometimes indicated by fine ridges formed by the bases of the processes, both concave. The cingulum measures 12μ wide, the sulcus 8μ at the level of the cingulum and 16μ near the antiapex, before widening completely.
Holotype: SGO PmPb 1323/2 (N 41/1). Core 10, sample 1, between 1462-1458 m.
Rocallosa Formation.
Holotype measurements: 95.2 x 81.5u (without processes); processes up to 13.6u; apical process +/- 20μ; antiapical process +/- 20μ.
Dimensions: 72-96μ long by 52-82μ wide (without processes); processes up to 20u long, generally 16μ (15 measurements).
Provenance: Between 1462-1458 m and between 1176-1172 m. Strasbourg 8156-8158, 8161-8162. Rocallosa Formations (middle) and Chorrilo Chico Formations (lower).
Main material studied: Strasbourg 8156/1 (Y 29/3); SGO PmPb 1323/1 (O 55/2); SGO PmPb 1323/1 (R 50); SGO PmPb 1323/1 (T 51); SGO PmPb 1323/2 (Q 44/3).
Discussion and Comparisons: This species differs from L. bipolare (Cookson and Eisenack) De Coninck 1968 in the shape of its processes and in having a less robust but longer apical process, which also applies to the antiapical process. In some positions of the specimens, the antiapical process is not easily visible. In our thesis (Troncoso 1977), we had assigned this shape to the genus Exochosphaeridium; new material has allowed us to realize that it actually belongs to the genus Lanternosphaeridium. The specific epithet honors the palinologist Mlle. Jeanne Doubinger of Strasbourg, France.
Lanternosphaeridium doubingeri Troncoso in Troncoso and Doubinger, 1980, p.103, pl.3, figs.7–9. Holotype: Troncoso and Doubinger, 1980, pl.3, figs.8–9. Age: Maastrichtian–Danian.
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Original description: [Troncoso and Doubinger, 1980] (translated from Spanish):
Lanternosphaeridium doubingeri Troncoso sp. n.
Plate 3, figs. 7, 8, and 9.
Diagnosis: Body generally elliptical, thick-walled. Punctate-fibrous surface with numerous processes of variable shape, size, and apex: simple, forked, or doubly forked. The apex of the processes is truncate or acute; the base of the processes is fibrous, of variable width. The processes are joined by ridges originating from the widening of these bases; sometimes the processes are perforated near the base.
The cyst exhibits clear bipolarity, indicated by the apical and antiapical processes being longer than the rest; the apical one is also wider.
The precingular archeopyle is separated from the apical process. The cingulum and sulcus are sometimes indicated by fine ridges formed by the bases of the processes, both concave. The cingulum measures 12μ wide, the sulcus 8μ at the level of the cingulum and 16μ near the antiapex, before widening completely.
Holotype: SGO PmPb 1323/2 (N 41/1). Core 10, sample 1, between 1462-1458 m.
Rocallosa Formation.
Holotype measurements: 95.2 x 81.5u (without processes); processes up to 13.6u; apical process +/- 20μ; antiapical process +/- 20μ.
Dimensions: 72-96μ long by 52-82μ wide (without processes); processes up to 20u long, generally 16μ (15 measurements).
Provenance: Between 1462-1458 m and between 1176-1172 m. Strasbourg 8156-8158, 8161-8162. Rocallosa Formations (middle) and Chorrilo Chico Formations (lower).
Main material studied: Strasbourg 8156/1 (Y 29/3); SGO PmPb 1323/1 (O 55/2); SGO PmPb 1323/1 (R 50); SGO PmPb 1323/1 (T 51); SGO PmPb 1323/2 (Q 44/3).
Discussion and Comparisons: This species differs from L. bipolare (Cookson and Eisenack) De Coninck 1968 in the shape of its processes and in having a less robust but longer apical process, which also applies to the antiapical process. In some positions of the specimens, the antiapical process is not easily visible. In our thesis (Troncoso 1977), we had assigned this shape to the genus Exochosphaeridium; new material has allowed us to realize that it actually belongs to the genus Lanternosphaeridium. The specific epithet honors the palinologist Mlle. Jeanne Doubinger of Strasbourg, France.