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Glyphanodinium
From Williams et al., 2017:
[Glyphanodinium, Drugg, 1964, p. 237-238
Type species: Glyphanodinium facetum, Drugg, 1964 (figs.1–2)]
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Original description: [Drugg, 1964]:
Description:
Test small, angular, five-sided in outline. A transverse furrow divides the test into a small epitheca and a relatively large hypotheca. A longitudinal furrow interrupts the girdle and extends onto both the epitheca and hypotheca. Ventral side of test flat to concave. Dorsal hypotheca is chisel-shaped at the antapex.
Tabulation: one (?) apical plate, five precingular plates, six girdle plates, one posterior ventral plate, one posterior intercalary plate, and one antapical plate. The test opens by detachment of the apical plate.
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Modified description:
Stover and Evitt, 1978, p. 51:
Synopsis:
Cysts proximate, dorso-ventrally compressed, outline pentagonal; paratabulation gonyaulacacean, indicated by low parasutural ridges; epicyst smaller than hypocyst; archeopyle apical.
Description:
Shape: Outline pentagonal; specimens compressed dorso-ventrally.
Wall relationships: Autophragm only.
Wall features: Parasutural ridges low, smooth, and continuous. Autophragm smooth, in the main darkly and unevenly colored.
Paratabulation: Expressed clearly by parasutural ridges; gonyaulacacean, formula: 1`, 5", 6c, 6```, 1p, 1````, 2s. The paraplate originally designated 1pv is here interpreted as a posterior sulcal paraplate.
Archeopyle: Apical, atypical; operculum free or attached, generally the latter.
Paracingulum: Indicated by six subrectangular paraplates; divides cyst into relatively shorter epicyst and longer hypocyst.
Parasulcus: Delimited by parasutural ridges, wider antapically than apically; posterior sulcal paraplate relatively large.
Size: Small.
Affinities:
Glyphanodinium differs from Phanerodinium in lacking serrate ridges and gonal spines. Lack of precise information about the paratabulation on the hypocyst and the archeopyle on Phanerodinium precludes further comparison of these two genera.
[Glyphanodinium, Drugg, 1964, p. 237-238
Type species: Glyphanodinium facetum, Drugg, 1964 (figs.1–2)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Drugg, 1964]:
Description:
Test small, angular, five-sided in outline. A transverse furrow divides the test into a small epitheca and a relatively large hypotheca. A longitudinal furrow interrupts the girdle and extends onto both the epitheca and hypotheca. Ventral side of test flat to concave. Dorsal hypotheca is chisel-shaped at the antapex.
Tabulation: one (?) apical plate, five precingular plates, six girdle plates, one posterior ventral plate, one posterior intercalary plate, and one antapical plate. The test opens by detachment of the apical plate.
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Modified description:
Stover and Evitt, 1978, p. 51:
Synopsis:
Cysts proximate, dorso-ventrally compressed, outline pentagonal; paratabulation gonyaulacacean, indicated by low parasutural ridges; epicyst smaller than hypocyst; archeopyle apical.
Description:
Shape: Outline pentagonal; specimens compressed dorso-ventrally.
Wall relationships: Autophragm only.
Wall features: Parasutural ridges low, smooth, and continuous. Autophragm smooth, in the main darkly and unevenly colored.
Paratabulation: Expressed clearly by parasutural ridges; gonyaulacacean, formula: 1`, 5", 6c, 6```, 1p, 1````, 2s. The paraplate originally designated 1pv is here interpreted as a posterior sulcal paraplate.
Archeopyle: Apical, atypical; operculum free or attached, generally the latter.
Paracingulum: Indicated by six subrectangular paraplates; divides cyst into relatively shorter epicyst and longer hypocyst.
Parasulcus: Delimited by parasutural ridges, wider antapically than apically; posterior sulcal paraplate relatively large.
Size: Small.
Affinities:
Glyphanodinium differs from Phanerodinium in lacking serrate ridges and gonal spines. Lack of precise information about the paratabulation on the hypocyst and the archeopyle on Phanerodinium precludes further comparison of these two genera.