Radial, trilete, miospores. Amb triangular, sides slightly to strongly concave, apices rounded or truncated. Trilete mark distinct; sutures straight simple or accompanied by low narrow labra extending within a very short distance of the equatorial margin. Exine extended laterally in the equatorial plane to form well-developed auriculae in the radial positions, inter-radial connections between auriculae reduced or absent. Distal surface of auriculae plicated; remainder of exine laevigate.
Schemel, 1950, p. 243, pl. 40, fig. 11
Overall equatorial diameter 30(42)50 µm
Mississippian; late Visean to early Serpukhovian [early Arnsbergian], VF to TK biozones (Clayton et al., 1977, Owens et al., 1977)
MPK 7555 Figure 59a
Shales below Hurlet Limestone, Hurlet Borehole 85.50 m, Scotland; Visean, VF Biozone, Sample MPA 9155, Specimen MPK 7555. Specimen with slightly concave inter-radial margins and rounded apices. Well-developed plicated auriculae present at radial margins with no obvious inter-radial thickenings.
Specimen maximum dimension 39 µm.
MPK 7556 Figure 59b
Shales below Faraday House Sill, Argill Beck, Stainmore, Cumbria, England; Serpukhovian [Pendleian], NC Biozone, Sample LCS, Specimen MPK 7556. Simple trilete mark with indication of minor labra development; sutures extend more than three-quarters of spore radius. Radial margins bear prominent plicated auriculae that are connected by narrower inter-radial crassitudes.
Specimen maximum dimension 47 µm