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Parvocavatus
From Williams et al., 2017:
[Parvocavatus, Gitmez, 1970, p. 306
Type species: Parvocavatus tuberosus, Gitmez, 1970 (pl.6, fig.9; text-fig.31)]
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Original description: [Gitmez, 1970]:
Description:
Cavate dinoflagellate cysts, subspherical, ovate to elongate, with the tabulation 4`, 6", 6c, 6```, 1````. Cingulum circular and nearly equatorial. Sulcus long and extending onto epitract and hypotract to equal length. Apical horn present and formed by the periphragm; this is hollow and has a hole at its tip. Thin periblast surrounding a spheroidal endoblast; the latter is thick walled.
Archeopyle apical, the operculum remaining attached. Surface of periphragm smooth, but surface of endophragm densely tuberculate.
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Modified description:
Stover and Evitt,1978, p. 72:
Synopsis:
Cysts cavate, subspherical with short apical horn; probably gonyaulacacean, paratabulation indicated by faint parasutural markings on periphragm; archeopyle apical, probably Type (tA).
Description:
Shape: Subspherical with a short apical horn.
Wall relationships: Endophragm close to periphragm except at apical horn.
Wall features: Parasutural features are faint linear markings on the periphragm. Endophragm thick and densely tuberculate; periphragm thin and smooth.
Paratabulation: Indicated by faint parasutural features; probably gonyaulacacean, formula: 4`, 6", 6c, 6```, 1````.
Archeopyle: Apical, probably Type (tA), described as having an incipient ventral opening; operculum seemingly remains attached.
Paracingulum: Indicated by transverse linear markings.
Parasulcus: Long, narrow, undivided area extending from the archeopyle margin to paraplate 1```` and delimited by linear markings.
Size: Intermediate.
Affinities:
Parvocavatus differs from Gardodinium in lacking processes between the two wall layers.
[Parvocavatus, Gitmez, 1970, p. 306
Type species: Parvocavatus tuberosus, Gitmez, 1970 (pl.6, fig.9; text-fig.31)]
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Original description: [Gitmez, 1970]:
Description:
Cavate dinoflagellate cysts, subspherical, ovate to elongate, with the tabulation 4`, 6", 6c, 6```, 1````. Cingulum circular and nearly equatorial. Sulcus long and extending onto epitract and hypotract to equal length. Apical horn present and formed by the periphragm; this is hollow and has a hole at its tip. Thin periblast surrounding a spheroidal endoblast; the latter is thick walled.
Archeopyle apical, the operculum remaining attached. Surface of periphragm smooth, but surface of endophragm densely tuberculate.
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Modified description:
Stover and Evitt,1978, p. 72:
Synopsis:
Cysts cavate, subspherical with short apical horn; probably gonyaulacacean, paratabulation indicated by faint parasutural markings on periphragm; archeopyle apical, probably Type (tA).
Description:
Shape: Subspherical with a short apical horn.
Wall relationships: Endophragm close to periphragm except at apical horn.
Wall features: Parasutural features are faint linear markings on the periphragm. Endophragm thick and densely tuberculate; periphragm thin and smooth.
Paratabulation: Indicated by faint parasutural features; probably gonyaulacacean, formula: 4`, 6", 6c, 6```, 1````.
Archeopyle: Apical, probably Type (tA), described as having an incipient ventral opening; operculum seemingly remains attached.
Paracingulum: Indicated by transverse linear markings.
Parasulcus: Long, narrow, undivided area extending from the archeopyle margin to paraplate 1```` and delimited by linear markings.
Size: Intermediate.
Affinities:
Parvocavatus differs from Gardodinium in lacking processes between the two wall layers.