(Waltz) Potonié & Kremp, 1956
Radial, trilete, acamerate miospores. Amb triangular to sub-triangular with rounded apices and straight to concave sides. Trilete mark distinct; sutures simple, straight, extend from two-thirds to the full radius of the spore body. Spore body more or less laevigate. Exoexine extended in the equatorial plane to produce variable cingulum which is narrow (2–4 µm) in the inter-radial areas but greatly expanded in the radial positions to form prominent auriculae. Outer margins of auriculae thickened and laterally expanded to create large, homogenous cushion-like caps with a smooth to crenulate surface. Caps approximately 7 µm across when measured along a radius, and are 30 µm wide.
Potonié and Kremp, 1956, p. 88.
Playford, 1962, pp. 602–603, pl. 85, figs. 13–14
Overall equatorial diameter 38(51)66 µm.
Diameter of spore body 24(34)44 µm
Mississippian; ?late Visean to early Serpukhovian [early Arnsbergian]; ?VF to TK biozones (Clayton et al., 1977, and Owens et al., 1977)
MPK 7755 Figure 61a
Lower Limestone Group, Tirfergus Glen, Machrihanish, Argyll, Scotland; Serpukhovian [Pendleian], NC Biozone, Sample MPA 33341, Specimen MPK 7755. Specimen with straight-sided inner body with rounded apices. Equatorial cingulum narrow inter-radially, but expanded radially to form wide auriculae which are capped by expanded crenulate pads. Trilete rays simple extending to body margin.
Specimen maximum dimension 41 µm.
MPK 7757 Figure 61b
Lower Limestone Group, Drumlemble Borehole A, Machrihanish, Argyll, Scotland; Serpukhovian [Pendleian], NC Biozone, Sample MPA 33328, Specimen MPK 7757.
Specimen maximum dimension 43 µm.