Archaeosphaeridium australensis Perch-Nielsen, 1975

Fig. 9. Archaeomonad stomatocysts from Rupelian (lower Oligocene) of Poland. A. Archaeomonas cf. mamillosa Tynan, 1960, DMF stub 352-1m, Futoma 5, in anterior view. B. Archaeomonas semplicia Rampi, 1969 DMF stub 349-2g, Borek Nowy Kawalec, in lateral view. C. Archaeomonas sphaerica Deflandre, 1932a, DMF stub 349-17h, Futoma 4, in anterio-lateral view.D. Archaeomonas aff. sphaerica Deflandre, 1932a, DMF stub 333-18c, Łubno 4, in anterio-lateral view. E. Archaeomonas tubulata Deflandre, 1938, DMF stub 352-1n, Futoma 5, in lateral view (E1), anterio-lateral view (E2), looking into the tubular collar, showing pore surrounded by flat planar annulus (arrow). F. Archaeosphaeridium australensis Perch-Nielsen, 1975, DMF stub 352-1o, Futoma 5, in lateral view showing prominent posterior spines (F1, arrows), anterio-lateral view showing characteristically wide collar (F2). G, H. Litharchaeocystis centparatethianus Ehrman sp. nov. G. DMF stub 349-17i, Futoma 4, in anterio-lateral view, showing structure of collar system with inner layer (black arrow), outer layer (white arrow), and arches in basal part of collar with windows in between (arrowhead). H. DMF stub 333- 10 (KRAM A-35), holotype,, Łubno 4, in posterio-lateral view showing details of flattened posterior pole. I, J. Litheusphaerella spectabilis Deflandre, 1932c, Borek Nowy 12B. I. DMF stub 342-15c, in anterio-lateral view showing characteristic collar. J. DMF stub 342-15d, in anterior view showing collar and hollow spines. Scale bars 2 µm.

Fig. 9. Archaeomonad stomatocysts from Rupelian (lower Oligocene) of Poland. A. Archaeomonas cf. mamillosa Tynan, 1960, DMF stub 352-1m, Futoma 5, in anterior view. B. Archaeomonas semplicia Rampi, 1969 DMF stub 349-2g, Borek Nowy Kawalec, in lateral view. C. Archaeomonas sphaerica Deflandre, 1932a, DMF stub 349-17h, Futoma 4, in anterio-lateral view.D. Archaeomonas aff. sphaerica Deflandre, 1932a, DMF stub 333-18c, Łubno 4, in anterio-lateral view. E. Archaeomonas tubulata Deflandre, 1938, DMF stub 352-1n, Futoma 5, in lateral view (E1), anterio-lateral view (E2), looking into the tubular collar, showing pore surrounded by flat planar annulus (arrow). F. Archaeosphaeridium australensis Perch-Nielsen, 1975, DMF stub 352-1o, Futoma 5, in lateral view showing prominent posterior spines (F1, arrows), anterio-lateral view showing characteristically wide collar (F2). G, H. Litharchaeocystis centparatethianus Ehrman sp. nov. G. DMF stub 349-17i, Futoma 4, in anterio-lateral view, showing structure of collar system with inner layer (black arrow), outer layer (white arrow), and arches in basal part of collar with windows in between (arrowhead). H. DMF stub 333- 10 (KRAM A-35), holotype,, Łubno 4, in posterio-lateral view showing details of flattened posterior pole. I, J. Litheusphaerella spectabilis Deflandre, 1932c, Borek Nowy 12B. I. DMF stub 342-15c, in anterio-lateral view showing characteristic collar. J. DMF stub 342-15d, in anterior view showing collar and hollow spines. Scale bars 2 µm.

Fig. 1. Lithofacial map of the Menilite Formation below sheet-like shales complex (Borek Nowy member). Redrawn and modified from Kotlarczyk and Leśniak (1990, fig. 7), with permission of AGH University of Krakow Publishing, 2025.