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Hystrichosphaeropsis perforata
From Fensome et al., 2019:
Hystrichosphaeropsis perforata Schiøler, 1993, p.106, pl.2, figs.4–8; text-fig.3. Holotype: Schiøler, 1993, pl.2, fig.4; text-fig.3. Age: late Maastrichtian.
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Paratype: Schiøler, 1993
Locus typicus: Well MFA-4, Dan Field, Danish North Sea
Stratum typicum: early Late Maastrichtian
Original diagnosis: Schiøler, 1993, p.106
An elongate bicavate gonyaulacoid cyst with perforate to fenestrate periphragm. The epi- and hypocoel are large and of approximately the same size; the epicyst has acute apex, the hypocyst has rounded to flat termination.
Original description: Schiøler, 1993, p.106
An elongated bicavate cyst. The peri- and endophragm are smooth and appressed equatorially. The epiperiphragm tapers to a blunted horn. The hypoperiphragm terminates rounded to flat. The free part of the periphragm is perforated by large, generally axially elongated perforations (3-10µm). Sometimes the perforations are very closely spaced, giving the periphragm a fenestrate appearance (Pl. 2, fig. 8). The archaeopyle type is P(3); the peri- and endoperculum are free. The position of the paracingulum is indicated by 4 - 5 low and axially elongated protrosions of the periphragm (length of protrusions c. 3-5µm). Three of the protrusions on the holotype are indicated on text-fig. 3. The parasulcus is only faintly indicated. The paratabulation is partially indicated by folds or ridges on the periphragm: 4', 6", ?c, ?s, ?6''', ?p, 1''''.
Dimensions: holotyperange
length of pericyst 96 µm87(97)104 µm
width of pericyst 58 µm55(60) 67 µm
length of endocyst 38 µm35(41) 44 µm
width of endocyst 58 µm55(60) 67 µm
Specimens measured. 9
Affinities:
Schioler, 1993, p.106: The new species differs from all other species of Hystrichosphaeropsis in having a perforate periphragm.
Hystrichosphaeropsis perforata Schiøler, 1993, p.106, pl.2, figs.4–8; text-fig.3. Holotype: Schiøler, 1993, pl.2, fig.4; text-fig.3. Age: late Maastrichtian.
---------------------------------------------------------------------------------------------------
Paratype: Schiøler, 1993
Locus typicus: Well MFA-4, Dan Field, Danish North Sea
Stratum typicum: early Late Maastrichtian
Original diagnosis: Schiøler, 1993, p.106
An elongate bicavate gonyaulacoid cyst with perforate to fenestrate periphragm. The epi- and hypocoel are large and of approximately the same size; the epicyst has acute apex, the hypocyst has rounded to flat termination.
Original description: Schiøler, 1993, p.106
An elongated bicavate cyst. The peri- and endophragm are smooth and appressed equatorially. The epiperiphragm tapers to a blunted horn. The hypoperiphragm terminates rounded to flat. The free part of the periphragm is perforated by large, generally axially elongated perforations (3-10µm). Sometimes the perforations are very closely spaced, giving the periphragm a fenestrate appearance (Pl. 2, fig. 8). The archaeopyle type is P(3); the peri- and endoperculum are free. The position of the paracingulum is indicated by 4 - 5 low and axially elongated protrosions of the periphragm (length of protrusions c. 3-5µm). Three of the protrusions on the holotype are indicated on text-fig. 3. The parasulcus is only faintly indicated. The paratabulation is partially indicated by folds or ridges on the periphragm: 4', 6", ?c, ?s, ?6''', ?p, 1''''.
Dimensions: holotyperange
length of pericyst 96 µm87(97)104 µm
width of pericyst 58 µm55(60) 67 µm
length of endocyst 38 µm35(41) 44 µm
width of endocyst 58 µm55(60) 67 µm
Specimens measured. 9
Affinities:
Schioler, 1993, p.106: The new species differs from all other species of Hystrichosphaeropsis in having a perforate periphragm.