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Senoniasphaera
From Williams et al., 2017:
[Senoniasphaera, Clarke and Verdier, 1967, p. 61
Type species: Senoniasphaera protrusa, Clarke and Verdier, 1967 (pl.14, fig.8)]
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Original description: [Clarke and Verdier, 1967]:
Description:
Inner body round or oval. Outer membrane is extended from the inner body to form one apical two antapical and often two lateral horns. The inner body frequently protrudes into the apical and antapical horns. Tabulation present. Girdle and longitudinal furrow present.
Archaeopyle apical.
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Modified description:
Stover and Evitt, 1978, p. 80:
Synopsis:
Cysts proximate, circumcavate, lenticular to compressed peridinoid; lateral protrusions may be present; paratabulation probably gonyaulacacean, indicated incompletely by parasutural features; archeopyle apical, Type (tA); parasulcal notch offset.
Description:
Shape: Endocyst lenticular to compressed peridinoid; pericyst compressed peridinoid usually with one short rounded apical and two antapical protrusions; lateral protrusions may be present.
Wall relationships: Cysts circumcavate; endophragm and periphragm generally of similar shape; pericoel may be occupied in part by short pillarlike structures.
Wall features: Faint parasutural lines or folds may be present on epiperiphragm. Periphragm smooth, finely perforate, or reticulate.
Paratabulation: Generally expressed incompletely by the archeopyle and faint parasutural features; probably gonyaulacacean; formula for epicyst: 4`, 6``; indications of paratabulation on hypocyst vague and inconsistent.
Archeopyle: Apical, Type (tA); principal archeopyle suture zigzag; parasulcal notch offset; operculum free.
Paracingulum: Indicated by lateral projections; other indications indistinct.
Parasulcus: Position suggested by faint, longitudinal, midventral concavity on the hypocyst.
Size: Intermediate to large.
Affinities:
Senoniasphaera differs from Membranophoridium in having one or more of the following indications of paratabulation in addition to the archeopyle, ornamentation between endophragm and periphragm, and lateral horns. Senoniasphaera differs from Renidinium in that the pericoels are not limited to the ventral surface.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Senoniasphaera Clarke and Verdier, 1967. Diagnosis from Clarke and Verdier (1967, p.61): inner body round or oval. Outer membrane is extended from the inner body to form one apical, two antapical and often two lateral horns. The inner body frequently protrudes into the apical and antapical horns. Tabulation present. Girdle and longitudinal furrow present. Archeopyle apical. According to Clarke and Verdier (1967), Senoniasphaera differs from Aptea in the presence of tabulation.
[Senoniasphaera, Clarke and Verdier, 1967, p. 61
Type species: Senoniasphaera protrusa, Clarke and Verdier, 1967 (pl.14, fig.8)]
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Original description: [Clarke and Verdier, 1967]:
Description:
Inner body round or oval. Outer membrane is extended from the inner body to form one apical two antapical and often two lateral horns. The inner body frequently protrudes into the apical and antapical horns. Tabulation present. Girdle and longitudinal furrow present.
Archaeopyle apical.
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Modified description:
Stover and Evitt, 1978, p. 80:
Synopsis:
Cysts proximate, circumcavate, lenticular to compressed peridinoid; lateral protrusions may be present; paratabulation probably gonyaulacacean, indicated incompletely by parasutural features; archeopyle apical, Type (tA); parasulcal notch offset.
Description:
Shape: Endocyst lenticular to compressed peridinoid; pericyst compressed peridinoid usually with one short rounded apical and two antapical protrusions; lateral protrusions may be present.
Wall relationships: Cysts circumcavate; endophragm and periphragm generally of similar shape; pericoel may be occupied in part by short pillarlike structures.
Wall features: Faint parasutural lines or folds may be present on epiperiphragm. Periphragm smooth, finely perforate, or reticulate.
Paratabulation: Generally expressed incompletely by the archeopyle and faint parasutural features; probably gonyaulacacean; formula for epicyst: 4`, 6``; indications of paratabulation on hypocyst vague and inconsistent.
Archeopyle: Apical, Type (tA); principal archeopyle suture zigzag; parasulcal notch offset; operculum free.
Paracingulum: Indicated by lateral projections; other indications indistinct.
Parasulcus: Position suggested by faint, longitudinal, midventral concavity on the hypocyst.
Size: Intermediate to large.
Affinities:
Senoniasphaera differs from Membranophoridium in having one or more of the following indications of paratabulation in addition to the archeopyle, ornamentation between endophragm and periphragm, and lateral horns. Senoniasphaera differs from Renidinium in that the pericoels are not limited to the ventral surface.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Senoniasphaera Clarke and Verdier, 1967. Diagnosis from Clarke and Verdier (1967, p.61): inner body round or oval. Outer membrane is extended from the inner body to form one apical, two antapical and often two lateral horns. The inner body frequently protrudes into the apical and antapical horns. Tabulation present. Girdle and longitudinal furrow present. Archeopyle apical. According to Clarke and Verdier (1967), Senoniasphaera differs from Aptea in the presence of tabulation.