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Canninginopsis tabulata
From Fensome et al., 2019:
Canningiopsis tabulata (Davey and Verdier, 1974, p.630,632, pl.92, figs.1–4; pl.93, fig.6) Duxbury, 1977, p.27. Holotype: Davey and Verdier, 1974, pl.92, figs.1,4; Eisenack and Kjellström, 1981b, p.328b; Sarjeant, 1992b, figs.3–4; Fensome et al., 1995, figs.1–2 — p.1833; Fensome et al., 2019a, figs.14R–S. NOW Cerbia. Originally Cyclonephelium, subsequently Canninginopsis, thirdly (and now) Cerbia. Taxonomic senior synonym: Tenua hystrix, according to Sarjeant (1985a, p.94; 1992b, p.681) — however, by retaining Cerbia, Duxbury (2002, p.76.78) retained Cerbia tabulata by implication. Age: Aptian.
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Original description as Cyclonephelium tabulatum: [Davey and Verdier, 1974, p.630-631]:
Diagnosis:
The cyst is subcircular in outline and possesses a thin, smooth to lightly tuberculate wall. The processes are predominantly peritabular in position and clearly define the precingular and postcingular plates and the cingulum. The central part of the plates and the sulcal region are practically devoid of processes. The processes are short, stout, and capitate; they rarely branch distally or are joined proximally.
The archaeopyle is apical and has a strongly zigzag margin and a sulcal notch; the operculum is typically detached.
Description:
Since all the identified specimens possessed an apical archaeopyle and only rarely detached opercula were identified, it is difficult to precisely define the shape of the apical region. It is surmised, however, that it is of similar shape to that found in related species. That is, the cyst is rounded apically or has a reduced apical boss. The main part of the cyst is subcircular, or rarely slightly angular, in outline.
The processes are neatly aligned just within the plate margins and hence clearly define the tabulation in the precingular and postcingular regions. In each case five or six plates appear to be present. The parallel lines of processes, either side of a plate boundary, are 3 to 4 µm apart. Rare processes on the cingulum may indicate the position of plate boundaries; a distinct cingular tabulation, however, is not present. Two to three antapical and four apical plates appear to be present.
Canningiopsis tabulata (Davey and Verdier, 1974, p.630,632, pl.92, figs.1–4; pl.93, fig.6) Duxbury, 1977, p.27. Holotype: Davey and Verdier, 1974, pl.92, figs.1,4; Eisenack and Kjellström, 1981b, p.328b; Sarjeant, 1992b, figs.3–4; Fensome et al., 1995, figs.1–2 — p.1833; Fensome et al., 2019a, figs.14R–S. NOW Cerbia. Originally Cyclonephelium, subsequently Canninginopsis, thirdly (and now) Cerbia. Taxonomic senior synonym: Tenua hystrix, according to Sarjeant (1985a, p.94; 1992b, p.681) — however, by retaining Cerbia, Duxbury (2002, p.76.78) retained Cerbia tabulata by implication. Age: Aptian.
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Original description as Cyclonephelium tabulatum: [Davey and Verdier, 1974, p.630-631]:
Diagnosis:
The cyst is subcircular in outline and possesses a thin, smooth to lightly tuberculate wall. The processes are predominantly peritabular in position and clearly define the precingular and postcingular plates and the cingulum. The central part of the plates and the sulcal region are practically devoid of processes. The processes are short, stout, and capitate; they rarely branch distally or are joined proximally.
The archaeopyle is apical and has a strongly zigzag margin and a sulcal notch; the operculum is typically detached.
Description:
Since all the identified specimens possessed an apical archaeopyle and only rarely detached opercula were identified, it is difficult to precisely define the shape of the apical region. It is surmised, however, that it is of similar shape to that found in related species. That is, the cyst is rounded apically or has a reduced apical boss. The main part of the cyst is subcircular, or rarely slightly angular, in outline.
The processes are neatly aligned just within the plate margins and hence clearly define the tabulation in the precingular and postcingular regions. In each case five or six plates appear to be present. The parallel lines of processes, either side of a plate boundary, are 3 to 4 µm apart. Rare processes on the cingulum may indicate the position of plate boundaries; a distinct cingular tabulation, however, is not present. Two to three antapical and four apical plates appear to be present.