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Tectatodinium sp. 2 of chateauneuf 1980
Tectatodinium sp. 2 of Chateauneuf 1980
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Genus: Tectatodinium Wall, 1967
Type species: Tectatodinium pellitum Wall, 1967
Original description: Wall, 1967, p. 112-113
Spherical to ovoid dinoflagellate cysts without apical, antapical, or any other form of projections. Test wall double (resembling tectate pollen), the outer layer being thicker and less compact or homogenous than the inner. Test penetrated by a large dorsal precingular archeopyle representing the loss of one plate. A girdle or ventral sulcus rarely present.
Stover and Evitt, 1978, p. 193-194
Synopsis: Cysts proximate, subspherical to ellipsoidal; body composed of appressed endophragm and periphragm; surface smooth or faintly ornamented; paratabulation indicated by precingular, Type P, archeopyle.
Modified description: Shape: Subspherical to ellipsoidal.
Wall relationships: Endophragm and periphragm appressed; periphragm usually thicker than endophragm.
Wall features: No parasutural features. Surface smooth to faintly ornamented, and periphragm generally shows some kind of internal texture.
Paratabulation: Normally expressed by archeopyle only; other indications vague or inconsistent.
Archeopyle: Precingular, Type P (3"" only); operculum free.
Paracingulum: Not indicated.
Parasulcus: Not indicated.
Size: Small to intermediate.
Affinities:
Stover and Evitt, 1978, p. 193: Tectatodinium differs from Pyxidinopsis in that it is smooth or faintly ornamented rather than reticulate. It differs from Operculodinium in lacking nontabular cones, spines, or processes; and from Tapeinosphaeridium in having a thick two-layered wall instead of a thin, commonly folded autophragm.
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Genus: Tectatodinium Wall, 1967
Type species: Tectatodinium pellitum Wall, 1967
Original description: Wall, 1967, p. 112-113
Spherical to ovoid dinoflagellate cysts without apical, antapical, or any other form of projections. Test wall double (resembling tectate pollen), the outer layer being thicker and less compact or homogenous than the inner. Test penetrated by a large dorsal precingular archeopyle representing the loss of one plate. A girdle or ventral sulcus rarely present.
Stover and Evitt, 1978, p. 193-194
Synopsis: Cysts proximate, subspherical to ellipsoidal; body composed of appressed endophragm and periphragm; surface smooth or faintly ornamented; paratabulation indicated by precingular, Type P, archeopyle.
Modified description: Shape: Subspherical to ellipsoidal.
Wall relationships: Endophragm and periphragm appressed; periphragm usually thicker than endophragm.
Wall features: No parasutural features. Surface smooth to faintly ornamented, and periphragm generally shows some kind of internal texture.
Paratabulation: Normally expressed by archeopyle only; other indications vague or inconsistent.
Archeopyle: Precingular, Type P (3"" only); operculum free.
Paracingulum: Not indicated.
Parasulcus: Not indicated.
Size: Small to intermediate.
Affinities:
Stover and Evitt, 1978, p. 193: Tectatodinium differs from Pyxidinopsis in that it is smooth or faintly ornamented rather than reticulate. It differs from Operculodinium in lacking nontabular cones, spines, or processes; and from Tapeinosphaeridium in having a thick two-layered wall instead of a thin, commonly folded autophragm.