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Tubidermodinium
From Fensome et al., 2019:
Tubidermodinium Morgenroth, 1966a, p.16. Type: Morgenroth, 1966a, pl.3, fig.4, as Tubidermodinium sulcatum.
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Original description: [Morgenroth, 1966]: (Translation: Stover and Evitt, 1978, p. 222):
Description:
The polar-flattened central capsule is surrounded concentrically by a delicate outer shell, from which extend downwards trumpet-shaped invaginations. The central capsule shows an indistinct tabulation that is indicated barely in many specimens. The depressed girdle line is circular.
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Modified description:
Stover and Evitt, 1978, p. 222-223:
Synopsis:
Cysts subspherical to subpolygonal, holocavate, with autophragm joined to ectophragm by intratabular clusters of numerous short funnelform structures; paratabulation indicated by intratabular clusters and by pandasutural depressions of the ectophragm; combination epicystal archeopyle, Type "tAtP"a.
Description:
Shape: Subspherical.
Wall relationships: Cysts holocavate.
Wall features: No projecting parasutural features. Ectophragm supported and penetrated by numerous short, closely spaced, funnelform structures whose distal ends flare and merge smoothly with the unornamented ectophragm and whose proximal ends abut, but do not penetrate, the granular autophragm.
Paratabulation: Parasutural or pandasuturate areas indicated by absence of funnelform structures, which are arranged in intratabular clusters. Formula unknown, probably similar to that of Dinopterygium.
Archeopyle: Combination, epicystal, Type "tAtP"a; operculum attached at parasulcus but also found separated from hypocyst.
Paracingulum: Indicated by transversely elongate clusters of funnelform structures.
Parasulcus: Indicated by interruption in paracingulum and by concavity in equatorial outline in polar view.
Size: Intermediate.
Affinities:
Tubidermodinium differs from Dinopterygium in having the ectophragm depressed rather than elevated in the areas between intratabular features.
Tubidermodinium Morgenroth, 1966a, p.16. Type: Morgenroth, 1966a, pl.3, fig.4, as Tubidermodinium sulcatum.
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Original description: [Morgenroth, 1966]: (Translation: Stover and Evitt, 1978, p. 222):
Description:
The polar-flattened central capsule is surrounded concentrically by a delicate outer shell, from which extend downwards trumpet-shaped invaginations. The central capsule shows an indistinct tabulation that is indicated barely in many specimens. The depressed girdle line is circular.
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Modified description:
Stover and Evitt, 1978, p. 222-223:
Synopsis:
Cysts subspherical to subpolygonal, holocavate, with autophragm joined to ectophragm by intratabular clusters of numerous short funnelform structures; paratabulation indicated by intratabular clusters and by pandasutural depressions of the ectophragm; combination epicystal archeopyle, Type "tAtP"a.
Description:
Shape: Subspherical.
Wall relationships: Cysts holocavate.
Wall features: No projecting parasutural features. Ectophragm supported and penetrated by numerous short, closely spaced, funnelform structures whose distal ends flare and merge smoothly with the unornamented ectophragm and whose proximal ends abut, but do not penetrate, the granular autophragm.
Paratabulation: Parasutural or pandasuturate areas indicated by absence of funnelform structures, which are arranged in intratabular clusters. Formula unknown, probably similar to that of Dinopterygium.
Archeopyle: Combination, epicystal, Type "tAtP"a; operculum attached at parasulcus but also found separated from hypocyst.
Paracingulum: Indicated by transversely elongate clusters of funnelform structures.
Parasulcus: Indicated by interruption in paracingulum and by concavity in equatorial outline in polar view.
Size: Intermediate.
Affinities:
Tubidermodinium differs from Dinopterygium in having the ectophragm depressed rather than elevated in the areas between intratabular features.