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Tectatodinium grande
Tectatodinium grande Williams et al., 1993
Taxonomic senior synonym: Tectatodinium pellitum, according to Head (1994a, p.308).
Holotype: Manum et al., 1989, pl.20, figs.3-4 (as Tectatodinium sp.2)
Locus typicus: ODP Site 643A, Voring Plateau, Norwegian Sea
Stratum typicum: Late Miocene (probably Tortonian)
Original description: Williams et al., 1993, p. 57
Cysts proximate, spherical or nearly so, and thick-walled. Wall consists of a thin (1.0 µm or less) endophragm that is faintly structured and appressed to a much thicker and more compact periphragm (3.0 to 3.5 µm) composed of rather densely-packed, short, sinuous fibroid threads.
Archeopyle formed by the release of a 5-sided paraplate, presumably from a middorsal, precingular position; operculum monoplacoid and free. Other indications of dinoflagellate affinity such as paratabulation or the presence of a paracingulum or a parasulcus or horns are lacking.
Cysts 32 to 45 µm in diameter. Specimen illustrated by Manum et al., 1989, diameter, 36 µm.
Affinities: Williams et al., 1993,p. 57
The very thick wall (about 4.0 µm) coupled with the compact, densely fibroid periphragm characterize Tectatodinium grande. Tectatodinium minutum Matsuoka, 1983 has a thinner wall (about 2.0 µm) and is granular; the periphragm on T. pellitum Wall 1967 is also about one-half as thick as that of T. grande and is less dense; the wall in typical specimens of T. psilatum Wall & Dale in Wall et al., 1973 is smooth, and finally, the wall in T. rugulatum (Hansen 1977) McMinn 1988, which is as thick as that of T. grande, is less compact and rugulate.
Stratigraphic Range: Latest Paleocene to Late Miocene (Williams et al., 1993, p. 57).
Taxonomic senior synonym: Tectatodinium pellitum, according to Head (1994a, p.308).
Holotype: Manum et al., 1989, pl.20, figs.3-4 (as Tectatodinium sp.2)
Locus typicus: ODP Site 643A, Voring Plateau, Norwegian Sea
Stratum typicum: Late Miocene (probably Tortonian)
Original description: Williams et al., 1993, p. 57
Cysts proximate, spherical or nearly so, and thick-walled. Wall consists of a thin (1.0 µm or less) endophragm that is faintly structured and appressed to a much thicker and more compact periphragm (3.0 to 3.5 µm) composed of rather densely-packed, short, sinuous fibroid threads.
Archeopyle formed by the release of a 5-sided paraplate, presumably from a middorsal, precingular position; operculum monoplacoid and free. Other indications of dinoflagellate affinity such as paratabulation or the presence of a paracingulum or a parasulcus or horns are lacking.
Cysts 32 to 45 µm in diameter. Specimen illustrated by Manum et al., 1989, diameter, 36 µm.
Affinities: Williams et al., 1993,p. 57
The very thick wall (about 4.0 µm) coupled with the compact, densely fibroid periphragm characterize Tectatodinium grande. Tectatodinium minutum Matsuoka, 1983 has a thinner wall (about 2.0 µm) and is granular; the periphragm on T. pellitum Wall 1967 is also about one-half as thick as that of T. grande and is less dense; the wall in typical specimens of T. psilatum Wall & Dale in Wall et al., 1973 is smooth, and finally, the wall in T. rugulatum (Hansen 1977) McMinn 1988, which is as thick as that of T. grande, is less compact and rugulate.
Stratigraphic Range: Latest Paleocene to Late Miocene (Williams et al., 1993, p. 57).