Hystrichosphaeropsis perforata Schioler, 1993

Holotype: Schioler, 1993, pl.2, fig.4, text-fig.3
Paratype: Schioler, 1993
Locus typicus: Well MFA-4, Dan Field, Danish North Sea
Stratum typicum: early Late Maastrichtian

Original diagnosis: Schioler, 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: Schioler, 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.