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Gillinia
From Williams et al., 2017:
[Gillinia, Cookson and Eisenack, 1960a, p. 11-12
Type species: Gillinia hymenophora, Cookson and Eisenack, 1960a (pl.3, fig.4)]
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Original description: [Cookson and Eisenack, 1960]:
Description:
Shell circular or oval in outline, bearing fine surface ridges which partly or wholly delimit fields of varying shape and size and form two more or less spherical hollow membraneous structures with a net-like appearance on either side of the anterior surface.
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Modified description:
Stover and Evitt, 1978, p. 49:
Synopsis:
Cyst proximate, lenticular; body with two interconnected membranous structures, one on each side of the apical surface; paratabulation indicated incompletely by low parasutural ridges or folds; archaeopyle at apex, type unknown.
Description:
Shape: Lenticular, outline subcingular but modified apically by membraneous structures.
Wall relationships: Autophragm only or with endophragm and locally developed periphragm.
Wall features: Low parasutural ridges or folds on hypocyst; epicyst with two elevated membraneous structures - one on each side of the apical surface - connected apically by periphragmal bands. Cyst surface smooth.
Paratabulation: Indicated incompletely by parasutural features; formula for epicyst undetermined; for hypocyst: 4``` - ?6```, 1p, 1````.
Archaeopyle: At apex, type uncertain.
Paracingulum: Not indicated.
Parasulcus: Not delimited per se; contained within wide featureless area on hypocyst.
Size: Small
Affinities:
Gillinia is somewhat similar to Glyphanodinium and Phanerodinium, which are also small and lenticular; but Gillinia differs in having a rounded outline and unusual apical membraneous structures, which Glyphanodinium and Phanerodinium lack.
[Gillinia, Cookson and Eisenack, 1960a, p. 11-12
Type species: Gillinia hymenophora, Cookson and Eisenack, 1960a (pl.3, fig.4)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Cookson and Eisenack, 1960]:
Description:
Shell circular or oval in outline, bearing fine surface ridges which partly or wholly delimit fields of varying shape and size and form two more or less spherical hollow membraneous structures with a net-like appearance on either side of the anterior surface.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Modified description:
Stover and Evitt, 1978, p. 49:
Synopsis:
Cyst proximate, lenticular; body with two interconnected membranous structures, one on each side of the apical surface; paratabulation indicated incompletely by low parasutural ridges or folds; archaeopyle at apex, type unknown.
Description:
Shape: Lenticular, outline subcingular but modified apically by membraneous structures.
Wall relationships: Autophragm only or with endophragm and locally developed periphragm.
Wall features: Low parasutural ridges or folds on hypocyst; epicyst with two elevated membraneous structures - one on each side of the apical surface - connected apically by periphragmal bands. Cyst surface smooth.
Paratabulation: Indicated incompletely by parasutural features; formula for epicyst undetermined; for hypocyst: 4``` - ?6```, 1p, 1````.
Archaeopyle: At apex, type uncertain.
Paracingulum: Not indicated.
Parasulcus: Not delimited per se; contained within wide featureless area on hypocyst.
Size: Small
Affinities:
Gillinia is somewhat similar to Glyphanodinium and Phanerodinium, which are also small and lenticular; but Gillinia differs in having a rounded outline and unusual apical membraneous structures, which Glyphanodinium and Phanerodinium lack.