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Canninginopsis tabulata
Canningiopsis tabulata, (Davey and Verdier, 1974), Duxbury, 1977
Originally Cyclonephelium, subsequently Canninginopsis, thirdly Cerbia.
Tax. jr. synonym of Tenua hystrix Eisenack, 1958, according to Sarjeant, 1985. Stover and Williams, 1987, and Lentin and Williams, 1989, retained Canninginopsis (as Cerbia) tabulata as a separate species. Sarjeant, 1992, maintained his earlier opinion.
Holotype: Davey and Verdier 1974, pl.92, fig.1,4; Sarjeant, 1992, figs.3-4
Locus typicus: La BÚdoule, SE-France
Stratum typicum: Aptian: Gargasian
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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.
Originally Cyclonephelium, subsequently Canninginopsis, thirdly Cerbia.
Tax. jr. synonym of Tenua hystrix Eisenack, 1958, according to Sarjeant, 1985. Stover and Williams, 1987, and Lentin and Williams, 1989, retained Canninginopsis (as Cerbia) tabulata as a separate species. Sarjeant, 1992, maintained his earlier opinion.
Holotype: Davey and Verdier 1974, pl.92, fig.1,4; Sarjeant, 1992, figs.3-4
Locus typicus: La BÚdoule, SE-France
Stratum typicum: Aptian: Gargasian
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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.