Back
Pentadinium laticinctum ssp. granulatum
Pentadinium laticinctum ssp. granulatum Gocht, 1969
Holotype: Gocht, 1969, pl.9, fig.18; textfig.20c
Locus typicus: Meckelfeld core 86
Stratum typicum: Middle Oligocene
Translation: Geological Survey of Canada
Diagnosis Gocht, 1969, p.29:
Inner body thick-walled, with a radial structure (ducts?), the surface punctate or granulate.
Description Gocht, 1969, p.29:
In size and shape, this form resembles Gerlach"s nominate subspecies, 1961.
The thick-walled membrane of the spherical inner body is traversed by numerous rays which probably represent 57 ducts, with "granules" or "bulges" caught between their surface apertures. In contrast, the outer membrane is thin and distinctly tabulate, with the sutures replaced by ridge-like upfoldings which disappear towards the ventral side in the area of the longitudinal furrow. The archeopyle is located at the middle of the precingular series. The "transverse furrow" is markedly helicoid and is actually only an equatorial ridge, which is interrupted at the ventral side of the longitudinal furrow. At least here, on the ventral side, it may be duplicate; this, however, does not constitute a true furrow.
The epitheca consists of an approximately pentangular apical plate and five precingular plates, the third of which forms the archeopyle. The antapical plate is quadrangular. Whether it is bounded by five postcingulars or- as I believe- by four can not be clearly resolved, because no plate boundaries are visible in the region of the longitudinal furrow. Also Gerlach"s originals furnish no information in this regard. The wide "longitudinal furrow" runs from one polar field to the other without any visible differentiation.
Tabulation: 1", 5""-4(5?)""", 1"""; Lf.
Dimensions:
Diameter of outer membrane: 100-110 µm. Inner body: 64-74 µm
Holotype: diameter 100 µm, inner body 70: 64 µm
Affinities: Compared to the nominate subspecies, P . laticinctum granulatum has a thicker inner body wall with a radial structure and granulate surface.
Holotype: Gocht, 1969, pl.9, fig.18; textfig.20c
Locus typicus: Meckelfeld core 86
Stratum typicum: Middle Oligocene
Translation: Geological Survey of Canada
Diagnosis Gocht, 1969, p.29:
Inner body thick-walled, with a radial structure (ducts?), the surface punctate or granulate.
Description Gocht, 1969, p.29:
In size and shape, this form resembles Gerlach"s nominate subspecies, 1961.
The thick-walled membrane of the spherical inner body is traversed by numerous rays which probably represent 57 ducts, with "granules" or "bulges" caught between their surface apertures. In contrast, the outer membrane is thin and distinctly tabulate, with the sutures replaced by ridge-like upfoldings which disappear towards the ventral side in the area of the longitudinal furrow. The archeopyle is located at the middle of the precingular series. The "transverse furrow" is markedly helicoid and is actually only an equatorial ridge, which is interrupted at the ventral side of the longitudinal furrow. At least here, on the ventral side, it may be duplicate; this, however, does not constitute a true furrow.
The epitheca consists of an approximately pentangular apical plate and five precingular plates, the third of which forms the archeopyle. The antapical plate is quadrangular. Whether it is bounded by five postcingulars or- as I believe- by four can not be clearly resolved, because no plate boundaries are visible in the region of the longitudinal furrow. Also Gerlach"s originals furnish no information in this regard. The wide "longitudinal furrow" runs from one polar field to the other without any visible differentiation.
Tabulation: 1", 5""-4(5?)""", 1"""; Lf.
Dimensions:
Diameter of outer membrane: 100-110 µm. Inner body: 64-74 µm
Holotype: diameter 100 µm, inner body 70: 64 µm
Affinities: Compared to the nominate subspecies, P . laticinctum granulatum has a thicker inner body wall with a radial structure and granulate surface.