Boreocysta isfjordica, Arhus, 1992

Holotype: Arhus, 1992, fig.4E
Locus typicus: Janusfjellet, Spitsbergen
Stratum typicum: Valanginian

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Original description: [Arhus, 1992, p. 310]:

Description:
Elongated ellipsoidal Gx-cyst. Body length about twice the body width. The latter varies between 55 and 65 µm. Wall smooth to scabrate, layers not distinguishable (autophragm), but form a complex and variable pattern of partly branching, delicate, approximately 5 µm, occasionally up to 12 µm long, solid processes. Some of these widen distally, where they are at least partly connected by trabeculae that apparently do not reflect paratabulation. Complete ectophragm not preserved.
Apical archeopyle, type (tA) with a deep sulcal notch. The cyst has a tendency to split on both sides of the anterior sulcal paraplate.
Paraplates 1"-6" can also be distinguished due to parasutural splits along the archeopyle margin. 6" is about 9 µm broad.